As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED. APPARENT COMPRESSOR STALL ON INITIAL POWER REDUCTION ON TAKEOFF. UNABLE TO IDENTIFY WHICH ENGINE. ALL ENGINE INDICATIONS NORMAL. SUBSEQUENT ENGINE PERFORMANCE NORMAL. PERFORMED TSM SUP 73-00-00-810-866, STEP 4 D 1 THRU END OF TASK ON ENGINES NR 1 & NR 2. NO MAINTENANCE MESSAGES, ALL INSPECTIONS GOOD. ACCOMPLISHED ENGINE WASH. PERFORMED POWER ASSURANCE RUN ON NR 1 & NR 2 ENGINES PER AMM 71-00-00-710-008-B WITH NO DEFECTS NOTED. (SEE AALA201612209006).