I'm not the "brightest bulb in the box"
I couldn't leave well enough alone.
With the unloader not functioning as it should have been, the compressor was bleeding down the HP feed tube
back thru the high pressure cylinder.......not a good idea.
I checked the unloader tube, the unloader check valve pin (to verify the governor weight movement) and the check valve itself.
All appeared to be in working order.
So, WHY DIDN'T THE %*#$)@##%&% THING UNLOAD ?????
Finally, I FOUND IT !!!
Don't go gittin' yer hopes up there, sailor............