Unplug the tv for about 20 minutes and if it reappears after turn on return asap..Dont think too much about it and return it..
That red line should not be there...
BTW the VT50's are going for dirt cheap, now is the time to exchange.
PS4 - Directv Genie HR-44 3/C41 mini's, Sunday Ticket & MLB Xtra innings
Sony STR-DG1000 AVR
Mirage Omnisat V2 7.1 set up with Energy S10 Sub