Alpha One recently with outdrive removed for a seal replacement Problem no 'up' trim in the trim mode Down trim works fine and you 'can' carefully use the trailer tilt to raise the unit What is wrong?

The issue with the Alpha One outdrive likely stems from a malfunction in the trim system, possibly due to air trapped in the hydraulic system or a faulty trim cylinder or switch. Since the down trim works fine, it's possible that the up trim solenoid or wiring has failed. Additionally, check for any obstructions or damage to the trim system components that could impede their function. A thorough inspection of the hydraulic lines and connections is also recommended to identify any leaks or blockages.