What was found
(CAN) GALLEY HEATER SNAGGED BY PILOT AS OVERTEMPING DURING FLIGHT. MAINTENANCE FOUND A LOW FLOW IN THE AIR CONDITIONING AND BOROSCOPED THE SYS OF DUCTS TO FIND THE FORWARD CABIN CONDITIONED AIR DUCT, P/N GG670-95605-7 SEPARATED AT FS 682. THE DUCT WAS REATTACHED AND SECURED WITH A LEAK CHECK CARRIED OUT, FULL SYSTEM FLOW WAS RESTORED. THE GALLEY HEATER UPGRADE WAS CARRIED OUT JAN 13TH 2011 IAW SB GG670-95031-21-01 REPLACING THE 500 WATT HEATER WITH A 1000 WATT UPGRADED HEATER, PN GG670-95031-5. SL 21-025 DATED 13 OCT 2010, DETAILED TROUBLESHOOTING AND OPS PROCEDURES FOR THE NEW -5 HEATER TO AVOID OVERHEAT CONDITIONS DURING NORMAL OPERATION. FOLLOWED UP WITH AN ISAR PUBLICATION FEB 2011 TO INVESTIGATE GALLEY HEATER OVERHEATING ISSUES AND PRESENTLY DOES NOT OFFER A SOLUTION.