+1 on some general contact cleaning.

I had symptoms of LCM failure on my e39 530, most likely due to just not driving very much. Went through the process to get a new module, etc. but first I just removed the original one, cleaned the contacts and board with Deoxit, plugged it back in and it's been fine ever since. At least I had a spare.

It sounds counter-intuitive but a good removal and cleaning of contacts once brought back a completely dead old BMW transmission module. Car would not shift, everything lit up, and I simply pulled, cleaned and reinstalled (along with some doing the same on the grounds) and it worked just fine. It's not a bad idea to try.