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If you are not an A&P mechanic, give this information to him as this is too complex a procedure to be considered preventive maintenance, and the aircraft should be on jacks to test afterwards.
a.) on the hydraulic powerpack, there are two electrical solenoids threaded on the lower body.
b.) an "O" ring seals the inner plunger on the solenoids
c.) sometimes the hydraulic fluid seeps past the O ring into the center of the solenoid and is heated by the warm solenoid until the fluid "cooks" a bit and starts to get the consistancy of molasses, causing the plunger to stick.
d.) the corrective action is to remove the solenoids from the powerpack, disassemble them, clean the barrels with solvent with cotton swabs
e.) reassemble with new O rings.
f.) flush out the old hydraulic fluid, it may be sticky from age.
g.) replenish the fluid, check the operation of the hydaulics and bleed the air from the system.
Refer to your 1L-02 -2 (Illustrated Parts) and -4(Maintenance Manual) for details.
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