1989 mercury xr4 150 trim problems

[pdrhodes57]

I just bought a 1989 venture bass boat with a mercury 150 and I’m having trouble with my trim system. I was on the water a day after I bought it and the up trim stopped working. I decided it was my solenoid, replaced it and fixed the problem. I took it to the water the next day and my trim worked fine for probably 3 hours, then same thing it will trim down but not up. I can jump my solenoid and it works, just like last time. I’m stumped at this point and would like some input from someone that knows more than me about boats. Thanks so much