I want to thank Stephen who answered this question in December of 2007. I just started having a problem with a couple of buttons on a different Panasonic cordless model. I got to the point where even pressing the buttons hard wouldn't work. Thank you Stephen. I just took the phone apart, cleaned the circuit board with alchohol (where button contacts are) and it works like new!! You just saved me $80.00. Note to anyone else trying this fix. Make sure you take your time taking the halves of the phone apart (pry as you move upward to top of phone, be sure you have the 2 screws taken out in the battery compartment before you pry). Then take your time seeing how to take the circuit board out, remembering where small parts are in case some fall out, like the contacts for the battery which are held in by the 2 screws. In my model, there was one additional screw holding in the circuit card itself. Also be careful not to rip any wires from the circuit board when you separate it from the body of the phone. Then a q-tip with alcohol, then a dry q-tip over the area where the contacts are, and it's good as new!!
Albie, October 2008