Yes, t is an old link....but to me it shows some inherent problems with the electrical system because is all becoming more than coincidence now. Batteries / charging systems are part of that system and we had two major incidents in January resulting in the grounding, this serious electrical systems fire during flight test just over two years earlier.

Plus I believe the key cause of the current various diversions and tech delays are electrical system related, particularly UA's problems....but why UA is suffering more than most I have no idea.