Definitely not bad cluster.
I can try to help you with this. You would need to get PA Soft though - if you don't have it already, look for Tony's thread on the FS threads and buy it off him. I think its like $30 or something.
Most probably this was disabled through coding by the PO. If that is the case, you can enable this via PA Soft.
EDIT: Here is the FS thread from Tony:
http://www.zhpmafia.com/forums/showt...MW-SCANNER-1-4
EDIT#2
Here are the options screens under PA Soft to enable/disable the stuff your shop claimed is due to a "faulty cluster"
Acoustic warnings (key left in, seat belts etc) in the far right column
Lock/unlock chirps/blinks (under Anti-theft DWA options)