My guess is that the top diaphram on the actuator in both doors has failed from age. The upper diaphram (if similar to the diaphrams in the 108) is the one responsible for drawing down the locks. The lower diaphram pushes the locks up.

If you pull the door panels and take a look at the diaphrams, you will probably find the rubber brittle and cracked.

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Mike Tangas
73 280 SEL 4.5