repeated failure of nitrogen fill (relay contacts in PLC controller)

I've managed to repair several of these expensive Mitsubishi FX3s PLCs. One of eight tiny relays will die from over-use. Here's my detailed instructions on opening up the PLC controller. Soldering is required of course. . * https://staff.washington.edu/wbeaty/chem_PLCmitsub.html NOTE: this failure is caused by glove-leaks. If your gas-fill solenoid is cycling every five seconds, the relay-contacts will wear out after only months. Fix the glove-leaks, so it only cycles every few minutes. ALSO, I've had the large relay/contactor for the chiller also fail, with completely corroded contacts. Easy fix: move the wires on the large DPST relay's screw terminals, so the unused extra contacts are now switching the power for the chiller.

Equipment: Omni-lab 101965 glove box, Vacuum Atmospheres Inc.