A previous thread suggested using ACF-50. I've used that since. $1.65 from Aircraft Spruce. It is quite a thin liquid and unlikely to clog the tiny orifices in a multi-probe. The Dow-Corning or Super-Lube stuff can clog things.
But none fix a socket that leaks.

This seems like the thing to do: Rent a tool from Wings and Wheels for $25 plus $3.00 for the 3 O-Rings.
Jim

https://wingsandwheels.com/aircraft-...ntal-tool.html