What was found
(CAN) AT FL 380, ENG NR 2 ROLLED BACK FOR 15 SECONDS, AND THEN AUTO RELIGHT. AT -55C. ANTI ICE WAS OFF FOR ROLLBACK. PILOT ACTION WAS ANTI ICE MODE SELECTOR ON. ACFT WAS CLOSE TO A THUNDER CELL IN IMC CONDITIONS. ENG NR 2 VIBS 0.1 LP, 0.2 HP BLEED AIR ALL NORMAL. APU OFF. ENG NR 2 WAS ITT 30C WARMER THAN ENG 1. ALSO FUEL FLOW WAS 25 KGS MORE THAN ENG 1. ENG NR 2 EXTERNAL VIS INSPECTION FOUND NO FAULTS. NO FAILURE CORRELATED FAULTS FOUND THROUGH CMS. TSM 73-21-00-810-924A COMPLETED W/O FAULTS. CONS SERV ENGINE HAD 10,066 FH AND 4,612 FC.