electrical issues that were traced to an earthing point on the main electrical box in the baggage compartment
Yup.
Also a big issue with water/moisture in the area of the bulkhead where all the goodies like DAU and ECU's live. Bad EARTH and/or corrosion = nightmare.
Ask the 139 guys about it - it nearly cleaned up one in Australia.
VH-ESH Agusta Westland AW139
Very sobering read!
An Agusta is just like a Ferrari - the fastest way to get to where you are going to break down!
An analogy -
Somebody asked if the McLaren F1 was going to be like the Ferrari F40, Gordon Murray, the F1's chief designer, replied, "I don't think so, there's no one at McLaren who can weld that badly."