What was found
FLT 1262, LGB-SMF, AIR RETURN TO LGB, ENG NR 1 COMPRESSOR STALL (ECAM) THRUST LEVERS AT CL DETENT LEVEL AT FL230 "BANG" AND YAW AND VIBRATION SAW ZERO EPR, THEN WENT BACK TO NORMAL. DID NOT SHUT DOWN IAW QRH 6-26. PERFORMED TSM 71-00-00-710-013-A, GVI, BLEED VVALVE CK, VSV LUBE, BOROSCOPE OK. HI POWER TEST NR 11, ALL TEST OK, CHECK OK, ALL ENG PARAMETERS NORMAL. ACFT OK FOR SERVICE. (S)