i went in tuner setup and i selected dual tuners, on tuner1 signal is in the upper 90 for almost all except 103 and 99 and on tuner 2 its all 0. dish SL5 and multiswitch (im not using SWM)
Then if you've verified that the satellite antenna setup in the menus is correct then it sounds like a call to DirecTV to see if they have any thing to try and if not to get the receiver replaced.