Any idea how to fix this? underfloor door lock corroded

Yea, the lack of a picture isn't helping my cause. It is a "paddle" type latch for the underfloor external storage. "Road Sloth" is a 1994 Tioga 31' Class C. The problem is the mechanism that I need to lubricate is buried behind the paddle and I can't get to it to spray it.
Any other suggestions for a system to get the picture posted would be appreciated.