What was found
WHILE PERFORMING ASA T/C 78273000 FOUND SHORT TIME FAULT ON ENG #1 73-21281 EEC CHANNEL IS NOT ENERGIZED WITH THE ALTERNATOR VOLTAGE. GROUNDED - YES. REMOVED #1 ENGINE EEC ALTERNATOR AND ALTERNATOR ROTOR PER B737-900 AMM 73-21-08-000-801-F00, STEPS 2.E.- 2F. DISCARDED APPLICABLE O-RINGS AND SELF LOCKING NUT. INSTALLED #1 ALTERNATOR ROTOR ONLY PER AMM 73-21-08-400-801-F00, STEPS 3.F. (1)(A)-(F). NEW ORING INSTALLED ON #1 ENGINE HANDCRANKING DRIVE COVER #42649 08/28/2022. INSTALLED #1 ENG HANDCRANKING COVER IAW AMM TASK 76-63-01-400-801-F00. NO LEAKS NOTED. COMPLETED REPLACEMENT OF #1 ENG EEC ALTERNATOR ROTOR IAW AMM TASK 73-21-08-400-801-F00. NO LEAKS NOTED. NO FAULTS NOTED.