What was found
R2 WINDOW OVERHEAT. QRH ACCOMPLISHED. ACFT GROUNDED. NEW R2 WINDOW IS MARKED H13 & ITS RESISTANCE IDENTIFIES IT AS AN H14 OLD WINDOW IS MARKED H15. MOVED THE TAP FROM NR 2 TO NR 3 IAW WDM 30-41-11. REMOVED THE R2 WINDOW IAW AMM 56-12-11, VERIFIED NEW R2 WINDOW FWD & AFT CLEARANCES TOP & BOTTOM CLEARANCES, FLUSHNESS OF WINDOW ASSEMBLY AND OPEN AND CLOSE FORCE IAW AMM 56-12-11. FINISHED INSTALLATION OF R2 WINDOW & ACCOMPLISHED LEAK CHECK & OPERATIONAL HEAT TEST BOTH CHECKED GOOD IAW AMM 56-12-11-400-801 & AMM30-41-00-710-801.