Hi Chuck, Thank you for your question. To change out the stem assembly, seats, and springs on your model P99696LF faucet you will first need to shut off the water supply to the faucet and open the faucet to drain any residual water. You will need to pry off and remove the button on top of the handle to access the screw holding the handle in place. Unscrew the screw in a counter-clockwise direction and lift the handle up and off the faucet. Next is to unscrew and remove the bonnet nut that holds the stem assembly in place. You can now pull the stem assembly out and the seats and springs that are located directly under the stem assembly. Here is a link to the manual for your faucet that includes the parts diagram that will help with your repair.http://www.peerlessfaucet.com/custo...
There are also several videos available online that show this repair.