Mariner 90hp - Serial 5919066 which I think is a 1981 model. Tilt & Trim mechanics under the stern with hydraulics hoses to the motor - Worked fine last summer prior to dry/heated winter storage. Tilt trim won't work (fully charged battery "stutters" the selonoid). I think the motor is toasted. Questions: 1) How can I lower the unit (it is on a trailer); I have turned the knurled knob and was able to manually raise the unit. 2) How do I remove the electric motor from the hydulic appartus - everything seems to have been sealed on? THANKS IN ADVANCE...