As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
TWO ENGINES STALLED AT FL380. DFDR INVESTIGATION REVEALED THAT ONLY THE NUMBER 2 ENGINE STALLED. AIRPLANE ENCOUNTERED AN ATMOSPHERIC WAVE AT .80 MACH CAUSING AUDIBLE COMPRESSOR STALLS AND A FLUCTUATION IN THE MACH METER FROM .75 TO .84 RETURNING TO .80. CREW REPORTS ALL ENGINE PARAMETERS NORMAL. ALL AMM CHECKS WERE WITHIN LIMITS.