Proportion or combination brake valve

[1967KaiserM715]

Looking for some insight into my proportion/combination valve issues. It is leaking...again. 4th one, 1st was out of warranty, 2nd company wouldn't offer warranty, 3rd failed, 4th was a warranty for 3rd, now is out of warranty...

It's the typical PV-2 replacement valve, and I've found lots of info on leaking valves, but no conclusive evidence for positive end results. Mine is leaking out the rear output, out of the weep hole.

It's been quite frustrating. It was not leaking before I parked for winter, and was not leaking 2 days ago, now it's leaking and actually drained the rear reservoir for rear brakes. It just barely affects brake feeling, also must have something wrong with brake light has it hasn't gone off...