I recently refered an older couple to D/Tivo. They have had stand alones for 6-8 years so the HR's are a non starter. The install was last Thursday 2/9and all went well with the install and the D installer. The install includes one Tivo and one H-xx. Yesterday 2/12 they called me and reported several "blank" recordings. After troubleshooting a bit the result was, with anything recording no live channel was available on the other tuner and when recording two shows one is a blank. My first guess is a bad tuner Questions: 1. Is there anything in the swim/PI wiring that could cause the issue? 2. Any way to isolate tuner/LNB issues? They called in yesterday and were cut off twice and could not understand the CSR on the third try and hung up. Needless to say they are ready to "send back" the dish. Is there anything to try before a service call? Any input would be appreciated.