How do I reset a dsc installer code on a pc5010?

I believe it is Location 007. You have to know existing code to change. If you don't know the code, you can default the Panel. Info is in the Programming Manual. Just telling how to default won't help as default programming likey will not be what will work for you. Off top of head you need to remove ac and battery connect a jumper with 1 of the PGMs then power up in correct sequence. An Installer may even Make Installer Code Not Resettable, which means you need an Unlocker, or Change the board. Under $100. If you do that, may as well get the Latest and get the Power 1832, 4.6 is Latest Version, DSC has great stuff, Very Reliable. Good Luck. Can help with Programming if needed.