What was found
APPROX 1 HOUR AFTER DEPARTURE AT COMPLETION OF CLIMB TO FL 380, THE THROTTLES RETARD TO 1.35 EPR A POSSIBLE COMPRESSOR STALL HAPPENED AT THAT POINT AS WE HEARD A POP AND THE AIRCRAFT BOUNCED. NEITHER PILOT WAS LOOKING AT ENGINE INSTRUMENTS TO SEE ANY INDICATIONS. ENGINES RAN SMOOTHLY AND NO OTHER INDICATIONS ON INSTRUMENTS. T/S IAW FIM AND FOUND RT TPU AT FAULT, REPLACED TPU AND ACCOM ALL REG CKS IAW MM. ALL CKS NORMAL. OK FOR SERVICE. REPLACED RT TPU. (SW21200401256)