Yes - after the first year (once I lowered Quik) they refused to do any work on it - could get it onto the ramps.
Instead of being excited to work on it - they hated to touch it. So I've had to do all the work on it myself....
The LS is soooo unique I have not found any shop in town I would trust it with. Things like that aren't unique - diffs, exhaust, trannies... - there are a few shops in town.