Found this on the CMP site

http://www.cmpcorp.com/files/techman.pdf

Has a little bit at the start about compressor failure, one thing it states is that high discharge temperatures will discolour the valve plate and the discolouring will not rub off.

I once turned some reed valves over due to a wear ring on them to get a compressor pumping again, they lasted about a week or so before breaking. I put this down to them now being bent in the opposite direction. Are they being put back in the same way they were?

I once saw the suction valve retaining pin of a copeland compressor fired through the valve plate, leaving only a shiny mark on the cylinderhead. Its amazing what hydraulic pressure can develope in compressors pumping liquid.
Are the discharge valve retaining plates/fingers ok and not bent up more than they should be and thus allowing more flex in the valve reeds than normal?

Jon