sir, ang nasisira dun sa servo ay yung gears dun sa loob. IMO, you can't clean the gears unless you disassemble the whole servo, which is a delicate procedure becuase it takes a computer to calibrate the servo.

palagay ko disposable yung servo. Some shops in banawe sell servo repair kits but I had mine totally replaced sa casa. Mga 10k din yun including the labor.