I had similar issue ..Trim tilt motor would work then nothing . Port side
Having twin engines I was able too swap fuses, relays ..
My helper , grandson at throttle port trim & tilt in a power position , discovered it worked then did not when I wiggled relay .
This never happened during the years I owned but possibly from past owner was a issue and he corrected by a slight bending of relay leg making contact within box .. I put a slight bend and it has worked fine
HOPE I DONT JENX MYSELF .
PS . I Hate Volvo Penta. NEVER AGAIN . .