This blog will walk you through the replacement of the two Lip seals and perform your own oil change. EfoilSolutions provides a full kit but cannot offer technical assistance. If you purchase this kit and require help, please contact Frank at frank.strutzke@googlemail.com. This kit is available here.
Note: It will be easier to perform these repairs with the mast removed.
Step 1
If the Lift LCS is installed, remove the prop. For a conventional prop, remove the center bolt, then pull out the propeller and pin (the pin may fall out, make sure not to lose it). If the propeller is jammed, you may try to: a. lightly tap on it, b. soak it in water for about an hour, or, c. use a prop remover.
Step 2
Remove the four screws that connect the LCS base or shroud to the motor casing. Slide out the LCS base or shroud. Four replacement screws are provided. Use NEW/provided Allen Wrenches to remove the screws. 
Step 3
Remove the Rotary Seal from the shroud or LCS base. Use a sharp object is required. Replace with provided Lip Seal, open side facing motor.
Step 4
Use a sharp object to remove Lip Seal from motor. Remove and replace the compression O-Ring.
Step 5
Remove the drain fill screw and replace the O Ring. Tilt the motor with the screw hole facing downward. Without the seal and screw, the oil should drain easily; While the drain hole faces down, twist and rotate the motor housing in a circular motion to help the oil accumulate at the opening. If the oil appears very milky, clean it using brake cleaner. Use the straw attachment on the brake cleaner can to spray up the drain hole and help flush out any contaminants.
Step 6
Tilt the motor with the drain hole facing up. Install the second Rotary Seal provided, open side facing prop. Use syringe and thick needle provided to add about 114 ml of oil to the motor. The oil bottle provided contains slightly over this amount. DO NOT OVERFILL.
Step 7
Reassemble in reverse order.