What was found
LRD - FLT 3301 - POWER ROLL BACK, FL 200; -18C; SOLID IMC. NO BREAK IN CLOUDS. ENGINE ANTI-ICE ON. OBSERVED A POWER ROLLBACK AND RELIGHT ON NR 1 ENGINE. APPROX 1 OR 2 MINUTES LATER OBSERVED SIMILAR ROLLBACKS OF BOTH ENGINES. EACH ENGINE ROLLED BACK AND RELIT 2 OR 3 TIMES IN RAPID SUCCESSION. COMMENCED DESCENT TO 8000 (+10 OAT) AND NO FURTHER DISCREPANCIES NOTED. INSPECTED NR 1 AND 2 ENGINE IAW GE MM 72-00 FAULT ISOL. NO DEFECTS NOTED. AIRCRAFT RETURNED TO SERVICE. (M)