Loud Snap from Trane XE1000 after I shut off power
It's a 14 year old Trane XE1000 heat pump / ac. I shut the power off to the unit at the circuit breaker, went out and removed the right side panel, just to clean out some debris and check things out in general. The power was off about 5 minutes, I had the side panel off, and wasn't touching anything at the time, and I heard a loud snap come from somewhere in the unit. A capacitor discharging? Sheet metal flexing since I took off the side panel? Everything still works fine. Just wondering about the snap. Any ideas?