Some of the buttons on the Keypad have stop working. Still able to run the dishwasher but most of the settings are not working when you press the buttons. Is the Keypad part easy to replace. Can i get some suggestions on switcing it out or a place I can go to read on hw to replace that part?
Here are your parts
http://www.appliancepartspros.com/partsearch/modelsearch.aspx?model=PDW9280J00SS
Here is the best I could find as far as a manual
http://appliancejunk.com/ge/dishwasher/31-9137.pdf
Now for the bad news your problem can be caused by the keypad or the control board.
The normal way to troubleshoot is to check the keypad switches with a meter, if it checks out OK then replace the control board. Still a bit of a crap shoot but you have at least narrowed the odds in your favor.
See the manual on how to do this, with a little luck your keypad will match.
You will notice that several keypad switches use a common pin/track and that can explain why a number of switches do not work.
I would try the following first it usually fixes about half the units with this problem.
Connector Cleaning / Checking
Unplug the unit
Open it up
Remove the ribbon cable from the keypad to the control board at the control board.
Clean the edge connector.
If it is the type where there is not a connector just the insulation is removed, it can be cleaned with a pencil eraser. Do not use an ink eraser as it is too abrasive.
Check the tracks in the ribbon cable for hairline cracks. A magnifying glass helps here.
Clean the connectors. Use no residue electronics contact cleaner or isopropyl alcohol and a tooth brush. Be gentle and do not reconnect till all the solvent evaporates.
Reconnect everything and give it a try.