how to repair a reverse solenoid?

Hello, I am in need of a reverse solenoid part #900414 for my Maytag WU701 dishwasher; it’s from 1982 and the exterior is in pristine condition and everything else works like a charm…except the part mentioned.

The part is no longer available and extensive google searches have come up empty. So, I thought I’d try to repair the part myself. It is a reverse solenoid to open the detergent door. Wondering if you might have any suggestions for me?

Thanks so much.
Monica