I just bought an old 72 arrowglass viper with a mercruiser 140 and I'm having problems with the trim.The drive was up but somehow went down on its own now I can't get it back up I hear the motor running but it won't go up I have 3 buttons for trim top one says up, middle one says up\out, 3rd one says in, only the bottom one (in) works or atleast I hear the motor running ,But the drive won't go up.. which one do I use to put the drive up?.Is there anyway to check the trim fluid level? cause I don't see it all I see is a hole with a bolt labeled vent..this is my first boat so I'm a complete noob anyhelp is appreciated thanks in advance.