Panasonic TV error codes

[shep1001]

Anybody know what fault is indicated by 11 flashes of the red LED on a 2011 50" Panasonic plasma?. TV shuts down after 30 secs of being switched on and the LED would appear to be 'blinking' an error code. I have a 5yr warranty so Panasonic are coming to collect it next week to repair it but I am interested in what the fault might be, assuming the flashing LED is telling the engineer something.

TIA Shep