What was found
LEFT ENGINE SURGED BRIEFLY DURING TO. DURING CLIMB AT 15,000 SURGING HAPPENED AGAIN 1.30 TO 1.48. FUEL FLOW, EGT FOLLOWED EPR. N1, N2 AND N3 SURGED ENOUGH TO YAW AIRCRAFT BUT DID NOT SURGE AS QUICKLY AT EPR, FUEL FLOW, AND EGT. SURGING HAPPENED IN CRUISE, DESCENT, IDLE AND APPROACH. AT FLIGHT IDLE IN DESCENT EGT SURGED FROM 330 TO 410 AND THEN BACK TO 330. FOUND AERODYNAMIC TAPE MISSING AT LEFT PF RAKE PITOT HEAD. REINSTALLED TAPE REF WRI 77-11/6909 AMM 77-11-04-2. RAN LH ENG REF B-757 JRH. ALL ENGINE INDICATIONS NORMAL. FOUND AERODYNAMIC TAPE MISSING AT LEFT PF RAKE PITOT HEAD. REINSTALLED TAPE REF WRI 77-11/6909 AMM 77-11-04-2. RAN LH ENG REF B-757 JRH. ALL ENGINE INDICATIONS NORMAL.