Replace the phone cord that attaches the handset to the base of the telephone
Replace the the battery that powers the base
Lubricate power dial component on base logic board.
Lubricate volume slider.
Replace speaker inside the base of the General Electric Telephone 2-9710A
Replace internal battery of the handset device
Open the telephone's handset to allow access to logic board and other...
Removing the shell of the base to allow access to the logic board.