That’s old school, for sure. How do you know it has lost power?
Breach seal is hammered...thats the 1st fix
By the serial number in your picture, it's from 1974. You can check that database here: ARH lists a kit for them but recommends you call to tell them exactly what you have so they send the right kit since they make several: Vortek while they list a kit don't specify whether it will work in the older models but could likely build what you want/need: