Something very simple to try would be to give the trim solenoids a gentle whack with the handle of a screwdriver as it may simply be a bit of corrosion on the contacts.
On my Volvo-Penta unit the solenoids are located in the engine compartment right by the trim pump. There are two (up & down), each about an inch square. To clean the contacts they can be pulled right out.
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NHskier
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