There were discussions as to if oil analysis did show a development or not.
The SOAP trends on 'FCs failed gearbox were increasing rapidly prior to the accident. In fact some of the metals were well above BAH's internal alert levels. The gearbox remained in service as the levels being recorded were still below that recommended by Boeing in the MM.
The aircraft was to be positioned from Shetland to Aberdeen the next day for a gearbox change. Tragically it never made it.
It is surprising how similar this was to the Norne Super Puma crash. In that monitoring tools were being used, they were saying something was wrong, but unfortunatley the wrong decisions were made.