I have 2 maestro MA-600 dimmers (call them M1 and M2) each controlling its own set of counter lights. The dimmers are on opposite sides of the kitchen. On the gang plate, each is next to the main kitchen dimmer (M3). M1 is next to M3, while M2 is next to M3 remote. M1 and M2 had been working fine for the last 15 years. This month after a storm and a power outage, M1 now inexplicably controls M2's lights and vice versa. I tried looking at the wiring behind the dimmers but dont see any loose wires.
Any ideas? A short perhaps?