Hello,
I've had almost the same thing happen to me. A couple of weeks ago when setting up for the first time I turned off the BFD using the front on/off button, when I turned it back on both L/R level meters max'd out on me. I thought the BFD was for the bin. I managed to cure the problem by leaving the BFD unplugged for a couple of days.
This weekend prior to double checking all my connections I turned off the BFD and again when I turned it back on, the same max'd out level meters.
The BFD is once again unplugged for the next couple of days
