100 year old Otis / AC Brake

What are the odds of getting an AC Electomagnet brake rewired. It's getting weak and not fully releasing the brake when called. I can push it down manually with my little finger but now that it's cold outside the oil in it seems thick and will not pull down the release fully. Tried Hollister-Whitney for a retrofit but they don'y have one that fits.
Dave

Attached pic

Here is an attached jpeg of the full brake.
Dave

You can try to put a 120v plug in magnetic heater to the side of the brake to heat the oil up and help with the cold.