Interesting. Do we know whether both ADFs were tuned to the same NDB. I do not know Bali and I do not know what other aids would have been available or needed. For example, did the procedure require another NDB to be tuned as well? If both ADFs were tuned to the same NDB, I would have been very wary of only one needle swinging round.
Bergerie1. Sorry but can't help you on that lot. Apart from the published official Indonesian investigation, unable to locate more pertinent info. Presumably there would have been a US NTSB investigation but could not find it on the internet.