There was a guy in Europe who sold a aftermarket mAh counter =, sort of electric fuel gauge device. It could count frame loss. A couple of the aftermarket power distribution devices also can do a frame count I think. Thing is there was no real methodology to relate frame loss to holds, etc.
I know at least a couple of Team Futaba guys like Brian O'Meara and Bill Hempel are also flying LMA'a. Not sure what, if any, issues they have had.
If the aircraft has lots of carbon or other RF blocking materials it is critical to get the antennas out and away from that material.
What plane is it?