Hi there - Long shot I know.... I have a C5034NL input module with one flakey button (it IS a hardware issue, not a C-BUS/connectivity issue). I have tried the obvious contact cleaner etc, to no avail. I was just wondering if anyone has previously found an OEM source/part # for the equivalent PCB surface mount momentary switch used in this module (also guessing they use the same in many of their other switch Input modules too).... Cheers...