Just purchased a used CPP2 (lower serial number 1st series) was used by a lab and is quite chemically stained. Was told all is/was working. Thanks to some good folks on this forum I was able to get a copy of the operating instructions. My question is whats the best way to make sure all functions are working properly? I'm thinking to use water for the chemicals and fire it up and check temps - rotations - times and ??? Any other suggestions of how to test and what to look for greatly appreciated.