If you are getting 771s on your local channels, it's easy to tell if your dish is aligned properly even without knowing what satellite and transponder they are on. You need to check your 99c and 103c signals on the DVR (99a and 103b if you have a receiver). If they are in the 70s ( absolute minimum), preferably 80s or 90s, then your dish is aligned correctly on the 99 and 103 slots and your HD local transponders will be coming in at good strength.
As raoul788 posted, your HD locals are (or were) on Spaceway 2 at 99. The transponders would be one or two of TPs 1 thru 6 on the 99s (DVR) or 99b (receiver) screens. It's possible the HD locals could have moved satellites recently, DirecTV is moving stuff around now that the DirecTV11 satellite is available. But as I said, it really does not matter. Get 99c and 103c to good numbers and everything else will be peaked also.