What was found
WHEN ADVANCING THRUST LEVERS FOR TAKEOFF, "RIGHT PACK TEMP" EICAS MESSAGE APPEARED. A/C ABORTED TAKE-OFF (ATO) AND RETURNED TO GATE (BTB). MTX GROUNDED A/C, MTX DEFERRED RIGHT HAND PACK IAW ABX-MEL 21-51-1-1 MX ACTION C/W AND PLACARD INSTALLED A/C RELEISED NO ETOPS ,MX ACTION PROCEDURE 21-51-2 C/W . AND RETURNED A/C TO SERVICE.