150 TRP trim not working correctly?

[scottydog1]

I have a 1997 150 TRP on my skeeter bass boat. Last season my Trim started to make a sound like it had air in it. the O.B. motor would move a little then hesitate, then it would move again. Not sure what to do for filling or possibly bleading this hydrolic system. Any suggestions would be great.

[boats.net]

Trim it up all the way, let it sit for 15 or 20 minutes and top off fluid level. Repeat a couple of times.