H2 o in E +E bay
It was a Qantas 747 which had a lot of water in the E +E bay as a result of blocked galley sink, I believe. Cracked cover allowed water penetration. I think all the GCUs tripped, but they managed to get one gen. back on line, eventually.
They limped into BKK (IIRC) down to almost zero electrics.
Many years ago we had a quite a few incidents of spilled galley water in the VC10 getting onto the IRSs in the E and E bay and a waterproof cover was fitted over them.
Water and wiggly amps don't mix !