Mmmmm ....
Well my info comes from the 'Horses Mouth' and no mention was made of a MGB Chip light.
Yes there was increasing MGB increasing Temp indications ( and lotsa GRINDING noises) up to and until the Trans was cooled by water !!!
Happily the flight crew were 2 of the best senior captains (and personal friends of mine) in the company with many many years of experience and that paid off for them their passengers and the company ...
How about we now wait for any official notifications and investigations ... the crew did well it was the a/c that broke ... enough said.
Cheers Chaps ..