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If a different control panel resulted in no change, hmm... I'd unplug the aux pump and monovalve for grins. These can cause the control unit to enter a sort of 'safety mode' where things don't work right. Easy test, and free. I doubt the 7-port manifold is bad but if you can swap that, go for it.
The dual-chamber pods should be mostly the same, with different metal rods. You may need to re-clock the housing so the mounting ears and vacuum ports are aligned correctly. But yes, if you can find another one, it should be useable. Has to be from a 124 chassis though, IIRC other chassis (i.e., 126) use physically different pod sizes. (??)
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