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Yes. Those pure air plus units are old old old. Even if you get the purge kit and rebuild it. It's going to continue to stick open. The one In the ebay listing is the alot of people upgraded to when they were readily available

Known to be a pain to rebuild the purge... even after rebuild they will stick wide open. https://www.ebay.com/itm/333534424129

post a picture of your air dryer. the certain older type are not too good on being rebuilt and continue to have issues.

Negative on your # 1. The compressor runs all the time. The pressure protection valve allows air to pass thru top the governor that sends a signal to the unloader to shut off once the governor reaches the correct setting PSI. This is why people have issues with the overpressure valve blowing...

m939s can be air'd up from either end of the trucks.

If you know anyone with a gas operated compressor have them bring it to you. Or use your deuce to come share air

Get it home. Diagnose the issue. Then worry about parts. Unloader could just be stuck. Do not spray wd40 in it like some other geniuses do

If the tanks are seeing no air then the unloader line definitely has no air since its from the ppv side of the system.

Cage the brakes and crawl home