What was found
DURING 'C' CHK TEST FLIGHT OF ALL A/C SYSTEMS AND FUNCTION CHECKS, NR 1 FIRE HANDLE WOULD NOT OPERATE. SEQ 18 WORK ORDER 39794 PDIS 393, 26-10 0005670 17DEC07. NR 1 ENG FIRE HANDLE WOULD NOT MOVE. SUSPECT MOISTURE AT ALTITUDE. REPLACED NR 1 ENGINE FUEL SHUTOFF VALVE IAW MM 28-22-05-2. INSPECTED NR 1 ENG EMERGENCY SHUTDOWN SYS IAW MM 20-21-00-0. CLEANED AND LUBED NR 1 ENG LEADING EDGE HYD AND FUEL CABLES. REPLACED GROMMETS IAW MM 20-21-00-0. OPS CHECK PERFORMED IAW MM 28-22-05-2. CLOSED PANELS IAW MM 20-00-00.