Assuming that you have vacuum at the door actuator I'd look for debris in the duct. I've had rotten hoses that wouldn't deliver vacuum, and I've had leaves.
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Semi-retired technogeek...electronics / computer / 2-way / ham radio... WA6ILQ (45+years)
1985 Fleetwood 32' Southwind (Chev P30/454/TH400), dubbed "Lazarus" by friends... I resurrected it from the dead...
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