2 daya ago, is becan having trouble receiving network HD channels. SD was fine, HD channels in the 70's are fine and HBO HD is also fine. Trying to watch network HD (CBS, ABC, NBC, Fox) gave me a balnk screeen with a message that it was searching for a signal (771). System tests come back normal for signal strength on transponders with one exception. Within the system test, tuner one displays "OK, aquired at 87%" Tuner 2 says "OK, aquired at 24%". Swithcing the lines into tuners 1 and 2 gave the same result. If it ws a bad filter or line trouble, I would have expected the reverse results. This leads me to beleive tuner 2 is on its way out. If someone is home this morning, can you test tuner signal aquisition and tell me your readings?D* technician was out yesterday and unable to resolve the trouble. Called D* and they are sending a new box ( it will be my 3rd in 4 months). Update - I just did another system test and Tuner 1 now says 0 %, tuner 2 is ast 97%. WTF.