nowadays , RCA seems to mean "Really Crappy Apparatus"  . Thomson has sullied the name !!
if less than 1 yr old , will be under part warranty . labor might only be 90 dys ?
 havn't been an asc for rca since '04.  so,  not sure if it has changed  ( so much has ) .
anyway , u should still have 2 yrs on the crt. 
** **opening the cabinet WILL void the warranty ** **
may be just a loose connection or component failure in red drive/output. 
possible corrupted eeprom data ( which i doubt)
improper settings CAN result in a dead set.
PM if u really want the service menu entry proceedure.  
qrz