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My model, a 1967 Turbo, may be different form yours. I had an intermittent problem with the rear cowl flap operation, and it turned out to be a loose wire going to the fuse assembly. I finally found it by taking off the cowling, turning on the master, and wiggling wires around the cowl flap motor system in the back until I saw them finally start to move (that was after setting the flap position to close after it was stuck open.
Turned out that a bad solder joint caused it, and airflow during flying would sometimes disturb it just enough to get it to where it wouldn't work. Then next time I flew it would be OK, etc. Was a pain to find but once re-soldered properly I didn't have any more trouble.
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