What was found
AIRCRAFT WAS GROUNDED: FLIGHT AIR RETURNED TO CLT ON ACCOUNT OF NUMBER TWO ENGINE COMPRESSOR STALL. EMERGENCY WAS DECLARED. CREW REPORTS THEY WERE NOT AWARE THEY HAD A COMPRESSOR STALL, TOWER CALLED CREW TO LET THEM KNOW THERE WERE FLAMES COMING FROM THE TAILPIPE, MECHANICS ON THE GROUND HEARD MULTIPLE COMPRESSOR STALLS. MAINTENANCE FOUND THE LOWER VBV'S IN THE OPEN POSITION AND A BROKEN FLEX SHAFT. THE UPPER VBV'S WERE IN THE CLOSED POSITION. MAINTENANCE REMOVED AND REPLACED ALL SLAVE BLEED VALVES , MASTER BALLSRCEW ACT ASSEMBLY, BLEED VALVE STOP MECHANISM , ALL FLEX SHAFTS AND BLEED VALVE GEAR MOTOR ASSEMBLY. ACCOMPLISHED E2 POWER ASSURANCE CHECK IAW JOB CARD 26L40072006 SPECIAL BORESCOPE INSPECTION. (SEE SDR # AALA201909029005, AALA201909039033, AALA201909039031)