In the last few weeks I've had several blank recordings. The system test reports error code 0x43 on tuner 1. The signal strength is good and similar on both tuners. To rule out cabling problems I have switched the cables around and the problem stays on T1. So if the problem is not the cabling I think the issue could be the receiver (hr20-700) or the LNB (slimline 5). Both have been installed 4.5 years ago. I have a spare LNB sitting around so I could try to switch that out but, before I start climbing up ladders, I thought to ask here to see if anyone has a guess on what is the most likely culprit is. Additional info: single receiver, 125ft good quality coax to the dish. Thank you guys and galls.