The issue probably doesn't have anything to do with the 622's output after the outage. Typically what happens there is that when the TV loses power it goes back to its default settings out of the box. The 622 outputs to a modulated channel (usually 60 or 73), which you can check in the system info screen (Menu-6-1-3 box J). Usually you can just match that channel from system info to the channel on TV2 and you'll be fixed, but if not, read on.
When the power comes back on your tv will be on either air/antenna mode (which means the tv channels won't go higher than 69) or in cable/catv mode (channels higher than 69). All you have to do is make the settings match on the receiver output and on the tv.
You can change the 622 settings by pressing Menu-6-1-5 and switching between air and cable depending on whether the tv goes higher than channel 69. If higher, set the 622 for TV2 cable (TV1 output disabled) in the "Modulator Setup" screen and Done to save the change. The setting will default to 73, so just put TV2 on channel 73 and you should be fixed. The default for air mode on the 622 will be channel 60 and you just follow the same steps if your tv won't go higher than 69 except that you want the 622 to be set for air mode.
You can also change those modulation settings on the tv itself, but it would be pointless to post general instructions here in that each brand has different setup menus. Consult your manual.
If none of those suggestions work, you're probably looking at equipment failure on the part of the tv/622/cable and you want to have your wife call Dish for tech support.
Hope that wasn't too dense and good luck getting it fixed!