A client with an M1G which I installed several years ago has been encountering a number of errors for “1141 = Expansion Module Trouble.” Each trouble message is followed by a “1161 = Expansion Module Restored” message. the Extended Data for both is “Input Exp. 2.” In one instance powering off the panel and powering it back on resulted in a 5 hour period of no error messages. What should I look for?