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The test I described above would be a good next test. Disconnecting line C and applying regulated air directly to the system is another great way to look for system leaks. You said you connected a line and regulator. Did you shutoff the air supply after you pressurized the system? If the...

Yep, they can be a pita. Glued! Morons… He did the manual jumper method I described above and when he went H-B the jumper got hot in his hand, so something is pulling excessive current somewhere. When we last spoke he was working on looking for cross wiring between the solenoid wires To...

That black cover should slide back to expose where the wires are soldered into the pin cups.

That looks like a weak or high resistance electrical/ground connection to the coils of the PCU solenoids. A bad connection will pass full voltage, untill you pull current thru it. On a relay or solenoid coil it sees full voltage, and starts to build a field to pull in the contacts or plug...