The only thing that changed is that you removed the decoder to take it to MC. Hence the problem is/was with the connector on the cable coming from the LNB. Make sure the connectors on both ends of the cable are not showing signs of arcing as this could cause very selective issues with frequencies.
I presume the installer checked the antenna and LNB by connecting directly to the LNB? Or id he follow up with a check on the decoder itself?
Easyview, UEC 4T HD PVR, SD PVR, XV
Spare decoders: SD PVR(2), PACE HD PVR 4T, DSD 660, 1110, 1131, Explora
2 unmentionable FTA decoders
Win 10 Pro (64-bit) build 1607, version 14393.351
1.2m antenna, 8-way universal LNB, 2x6 MS, FSM permanently connected.