S115 Tilt/Trim Issue

[<Mooncusser>]

It's getting to be that time of year here in NE where I need to start thinking about taking the shrink wrap off the boat. At the end of the season last year, on the last trip of the year, I started having trouble with my trim unit trimming the motor up on its own. This was happening while underway and at rest. The swithch back at the engine had no effect on the trim but I could get it to go back down by using the switch on the binnacle. I'm guessing it's either a bad switch at the motot or a bad relay. I can't seem to fine which relay it is based on the diagrams on the Yamaha parts site. Can anyone help me figure out the part number for the relay? It's a 1998 V4 115 Salt water Series. Any other suggestions for what else to look at?

[<boats.net>]

Most of the time it is a bad switch ( water inside switch is a big problem, shorts out switch)
You can disconnect one switch at a time in order to determine the faulty one