Hmmm 400 bones that is darn good price if it is done correctly. I do not think I could do that if the unit was brought to my shop along with the new compressor. Lets do a bit of figuring here.
Pickup replacement compressor/new liquid line and suction line filter drier (this is a burnout and not to install a suction line drier nearly guarantess future failure of the replacement compressor) Minimum 1 hours at 45 per hour = 45 Compressor changeout and unit start up testing minimum 8 man hours at 45 = 360 Materials cost - Refrigerant/filter driers/misc fittings and consumables plus there is always a charge for the warranty compressor usually 50 dollars even though it is under warranty so figure about 250 here for materials more if the unit is like some of the old Lennox Heat Pumps that take 12lbs of refrigerant. Now we probably have a 85 bones charge in there for the original service and diagnosis call. Now you have to make a seconfd trip out after a week or so to pull the suction filter drier out so add in another 200 bones. So Total on a straightforward compressor replacement job would be around 900 bones minimum. Most likely upon startup the real problem will rear it ugly head and get diagnosed like a bad conedensor fan that caused the compressor to die in the first place, so figure in some more cost there. Anyway if you boys want to take on the diagnosis and compressor changeouts and guarantee your work for 400 bones I can probably keep you working 24/7. Let me know when you want to start.