The only components of the power meter that can be serviced by the owner are the batteries, battery door, and battery door gasket. No other items are serviceable and no attempt should be made to adjust or alter any other items.
When cleaning the power meter, use only water-dampened cloth to wipe off dirt and debris. Never use any harsh cleaning chemicals that may damage the plastic housing. Inspect the battery compartment to ensure the battery contact is clean of any corrosion.