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Sounds like the extension numbers defaulted when it powered back up. To program extension numbers press program and the down arrow til the display says Extension No. then press the right arrow press the up or down arrows to select the desired extension number(11 through 22). Press save to store. To prevent the data from being lost when the next power outage occurs, make sure the 9 volt batteries are still in good order.
Just so we're on the same page, the PF buttons are the 12 buttons on the right and their ONLY function is one-touch dialing. They can't be CO buttons. The 12 buttons on the left are called CO buttons and they can be programmed to do a number of things, including CO, DSS, and feature access buttons.
To reprogram the button, press PROGRAM, the button, the dial 0 + the CO number (1-8) and STORE. Extensions are 1+ext and one-touch are 2+. Other features are in the programming guide.
The PF buttons are programmed by just dialing the digits, but if it calls out, you must dial an access code first, usually "9".
I assume that the program sequence that you started with was:
[Program], 99, [CO-09 Button], 2, [desired phone number], [Store].
To change it back to CO-09:
First go back to the phone that needs to be corrected,
[Program], 99, [CO-09 Button], 0, 09, [Store].