What was found
LEFT ENGINE SURGE COMPRESSOR STALL AT FL.360 DURING CLB AT 1.38 EPR LEFT ENG SURGE AGAIN BEFORE INITIAL DESCENT AND DURING DESCENT TOTAL OF 3 TIMES ALL ENGINE INDICATIONS NORMAL AFTER ENGINE SURGE. ACP INSPECTION OF LEFT ENG INLET, EXHAUST CHIP DETECTORS NO FAULTS OR DEFECTS NOTED. PER FIM 71-06-00 MM 71-00-00-206. ACCOMPLISH BITE OF L EEC PER FIM 73-21-00, NO FAULTS NOTED. CONTINUE TROUBLESHOOTING. OPERATIONALLY TESTED THE LT ENGINE ALTITUDE SWITCH PER MM 75-32-07. NO DEFECTS. FOUND 2 BOROSCOPE BLANKING PLUGS FOR IP AND HP TURBINE AT 5 O`CLOCK POSITION LOOSE SECURED AS REQUIRED BY BORO INSPECTOR. REPLACED ALTITUDE SWITCH PER MM 75-32-07 PER ROLLS ROYCE ADVICE. ACP TEST 3 PER MM 71-00-00, NO FAULT FOUN