Maintenance issue please help

Your ultimate solution depends on the source of the "grinding".

Is it constant or sporadic depending on the gears selected? Does it stop when the pedals are not turning? Does it stop when the wheels are not turning? Is it coming from the crankset/chainring area or the rear hub/cassette? Or neither?

If the chain is rubbing against the front derailleur cage, it is probably an adjustment issue. If the chain is "chattering" between cogs in the cassette, it is probably an adjustment issue. If you paid a shop to remove the "grinding" and it is back, then a reputable shop will most likely reinspect it and make the adjustment(s) as part of the original servicing.

If the grinding is due to worn components (most likely a worn chain or cassette or aging cables/housings), then the shop should have called that to your attention prior to servicing. In that case, you'll probably have to pay for replacing the worn component, which may or may not require readjustment of your drive train. Whether readjustment will cost you additional expense depends on the shop. It wouldn't be abnormal for a shop to make basic adjustments for free when installing a new cassette - especially if they had just performed a tune up. If the shop called your attention to worn components and you elected not to replace them as part of the servicing, then you kind of have to "take your medicine". Still a reputable shop would most likely replace the component and not recharge for a "re-tune"

If the "grinding" is due to grit in a bottom bracket or wheel bearing, then a reputable shop should have identified and fully serviced the bearings. Grinding could also be caused by grit imbedding into your brake pads - which you would hear only when braking. There are so many possibilities and definitions of "grinding" that you'll have to be a bit more specific to get corrective input from an internet fourm.

So you took your Cervelo uberbike to the bike shop for a tune because it was a little dirty...

Hmmmm.

So what was grinding the first time?

Thank you Sitzmark,

I am getting a new spoke due to breaking one on my zipp rear wheel and then they are going to replace the chain as there was a little ware in it which would help with the situation. Thanks for the descriptive response! Much appreciated!

Swampy, No I did not take it in just because it was dirty! I broke a spoke and noticed that it was still grinding when I was climbing with a group of people. I am new to the road biking world but raced Mt. bikes. I found out that when I was climbing talking to my guy at the shop that I was cross gearing which the chain was rubbing a little on the frond D. Thus I know not to cross gear.

Nrth said:

Thank you Sitzmark,
I am getting a new spoke due to breaking one on my zipp rear wheel and then they are going to replace the chain as there was a little ware in it which would help with the situation. Thanks for the descriptive response! Much appreciated!
Swampy, No I did not take it in just because it was dirty! I broke a spoke and noticed that it was still grinding when I was climbing with a group of people. I am new to the road biking world but raced Mt. bikes. I found out that when I was climbing talking to my guy at the shop that I was cross gearing which the chain was rubbing a little on the frond D. Thus I know not to cross gear.

How big are you? What model and year Zipp wheels? How many miles on the Zipp wheels? What hubs in the wheels? Do you know the cause of the spoke failure? Pothole or summat? There shouldn't be any grinding as a result of a broken spoke. Honestly, it's unlikely that a chain would make a "grinding" sound unless it was mega dirty and covered in grit. Grinding is typically the hallmark sound/feel of bearings that have gone all pear shaped. The usual culprits are BB bearings, hub bearings, or freehub bearings.