Hi Brian -- Please check the air pressure on the "supply Side" You may have 120 on Brake side and o on supply side-
This is the gauge on the right side on the panel. Also, with 0 air pressure on the supply side, you can operate the slide door manually. Try bringing up the air pressure on the supply side--- you do not need 120 to make this work.
Cordially,
Otto Burleson
Albuquerque, NM
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