What was found
CLIMBING THROUGH 10,000 FT, A CHANGE IN ENGINE PITCH SOUND. NR 2 ENGINE FUEL FLOW REPEATEDLY DROPPED 200 PPH FROM NORM & N1 DROPPED ABOUT 2 % FROM NORM. LASTED 2 SECONDS & WITH 3 DROPS IN 1 MINUTE & INDICATIONS RETURNED TO NORM. SAME SERIES OF DROPS OCCURED CLIMBING THROUGH 18000 & AT 31,000. LEVELED AT 34,000 & DIVERTED. AT LEVEL FLT & DESCENT, NO FF OR N1 DROPS. SERIES OF 5 INCIDENTS OF NR 2 ENGINE IGNITION LIGHT ILLUMINATING FOR 2 SECONDS & EXTINGUISHING. AFTER SHUTDOWN, NR 2 FADEC FLASHED ON & OFF SPORADICALLY. NO EIED MESSAGES & NO MINELCOS TRIPPED. REMOVED NR 2 ENGINE HMU AND INSTALLED O/H HMU. PERFORMED GROUND RUN, LEAK & OPS CHECKS, FUNCTION TESTED OK. NO DEFECTS NOTED.