I find it amazing that manufacturers put in a PLC just to sequence tripple foam solenoids...Proprietary I guess along with expensive repairs....I found a cheap alternative controller on ebay a few years ago maybe $20, a programmable stop light sequencer that would run on 24vac. I have it on the shelf JIC....My tri foam is a Dultmeier...It has a small black box installed that sequences the three solenoids, probably another proprietary part, but would be easy to source from them and wire in...I tried finding a PN on their website but didn't turn up anything...Maybe Carolina Pride would be so nice to email you the program so you can reload it if you chose to keep what you have?