Two months ago a matrix switch stopped working.
After troubleshooting for a couple sessions it came to be bad serial control due to apparent corroded contacts on a PCM-4.
Yesterday lost audio control in the customer's gym due to poor contact on an XP-6 IR port. Upon closer inspection, corrosion with white deposits was found on all 6 IR ports.I started spinning and plugging/unplugging all the jacks to try to restore good connection and head off a future problem but now the main display has lost IR control unless I put sideways pressure on its jack.
Apparently messing with it made the problems worse.
All components are indoors and the system has worked flawlessly for years until two months ago.

Has anyone else seen these types of corrosion problems?
If so, is it just the port or are the electronics involved?
Do I need to replace this processor or should I actually try to take it apart and clean it?
I don't understand what the cause is. Galvanic reaction from dissimilar metals of some sort? Most of the emitters are RTI.