Thanks for the suggestion. It is 38.5 degrees and spitting snow so I was not anxious to re-peak unless necessary. I did a factory default and an OTA update. TP 12177V still had no signal so I conclude that my scanning mishap was coincidental and that I had probably already lost 12177 prior to scanning. I did a rescan to retrieve GLC on 12060H then ventured outside to re-peak the dish. All it took was an almost imperceptible change in elevation to bring it in. A week or more ago on GLC I was about 12177V-46; 12060H-52, after the elevation adjust the numbers reversed 12177V-52: 12060H-46. I was glad I had my elevation adjustment turn-buckle modification. I marked the position with a pencil line, then moved up a bit and down a bit, then almost exactly back to the line and all is well.