Has anyone here ever had to use dielectric grease on any connectors (TCM, FICM, PCM) to solve any issues? if so, what where the issues leading to it?
thanks!!

Never had to use it to SOLVE a problem, but have used it to protect from them. That stuff really keeps the moisture off of anything. After a few years it turns to sticky plasticy shit though, so I try and avoid it on any connection that I make and know I'll be playing with later.