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Hi im kevin have you had fault codes read from gearbox ?
Ok this is likely your issue .the codes that were in the system would have given them the indication of a voltage issue .so the next step would be to go through and try to clean all the connections that got wet with some contact cleaner to attempt to right the issue
I cant explain this .does it matter how long its parked up for ?
Nothing in there should cause this issue ,certainly not with damp in the air .i believe its more likely that the voltage is dropping off during the period of time the car is parked .i woukd really need the faukt codes to go further with an accurate direction to repair
Ok this is ok but starter wont cause your issue .if you can get me codes i can assist further
I wait for your reply