You might also find some useful information at RepeaterBook.com
As for code plugs, why limit yourself to just the PM400? The CP200, CP200XLS, PR400, CM200, & CM300 all use same CPS. While you can't program your PM400 with a codeplug from any of the others, you can load them into the CPS and study them.
Frankly, trying to find a codeplug with frequencies you might want is not the best way to find frequency info. You are much better off with RR, repeaterbook, and websites for ham clubs in your area. They all will have accurate info. And a big bonus is that you will gain proficiency in programming by writing and then improving your own codeplugs.