What was found
EQPT OVHT LGT ON ALTN MODE SELECTED AS PER QRC EICAS LGT OUT NOTED ABOVE INF THAT EQUIP COOL ALT MODE OPERATED NORMALLY AND E XTINGUISHED OVHT CONDITION. CHKS GOOD. REPLACED PRIMARY SUPPLY #1 FAN AND VMU PER MM 21-58-06-014-001 A PART CHANGE INFO PARTS INFO UPDATE ND MM 21-58-06-000-808-C1. OPERATED AND LEAK CHECKED FAN DUCTING ROTABLE PARTS CHANGE WAS INDICATED - TT # 1218160 SN OFF 1846 ROTABLE PARTS CHANGE WAS INDICATED - TT # 1017892 SN OFF 1529 . ALL OKAY. ALSO CHECKED FOR INTEGRITY OF FAN AND VMU UNIT MOUNT S AND FOUND SECURED. NO VIBRATION NOTED. IPC REFERENCE # 21-58-06-02 FAN, AIR, COOLI OFF 19-2158-9-0001 1529 ON 19-2158-9-0001 2316