All the known issues relating to the entire electrical and battery system worry me, especially as the wiring is apparently not covered in the usual type of insulation, but an ultra thin coating of Teflon. Teflon is an amazing material, but not good at resisting abrasion. A problem on the coating over aluminium wire in a damp un-insulated area of the plane near the skin could be part of the problem. I will not be surprised if the wiring eventually has to be replaced.