Mercury K Planes
 

I have a 2007 Sunsation 288 MCOB with Mercury K planes on it. The port side tab goes down just fine but is very slow to raise. Sometimes it does not want to raise at all. I checked the voltage at the solenoids and everything seems ok there. Any suggestions on where to look next? I thought about reversing the hoses and seeing if the problem changes to the down stoke.

Sounds like a bad solenoid. I would try bypassing it and use the supply voltage to the motor wires. The pump has to be passing fluid to go down also through both lines.
Option b would be to swap solenoids.

Thank you for the tip. I used a jumper wire and bypassed the solenoids, unfortunately the results were the same. I guess my next option is to remove the pump and check for obstructions or debris. If there are any other suggestions I would greatly appreciate the help.