What was found
ON CLIMBOUT, ECAM INDICATED NR 2 ENG STALL, A/C SHUDDERED, A LOUD THUMP HEARD, & LT WING DIPPED, NO ABNORMAL ENG READING INDICATIONS NOTED. TURNED BACK & LANDED WITHOUT EVENT. MAINT TROUBLESHOT IAW TSM. R & R 7TH STAGE BLEED VALVE IAW AMM, & 7TH STAGE BLEED SOLENOID VALVE IAW AMM. ALSO TIGHTENED UNIONS ON 10TH STAGE BLEED SOLENOID VALVE, OPERATIONAL CHECK WAS GOOD PER AWA T/C F5M71312. CHECK OF BLEED SOLENOID VALVE CONFIRMED FAILURE OF UNIT, VALVE WOULD NOT OPERATE. DISASSY REVEALED PISTON SEALS & PLUNGER WORN BEYOND LIMITS. REPLACED PISTON, PLUNGER, SEALS, RING, & SHIMS. UNIT OVERHAULED & TESTED IAW CMM 75-32-51. VENDOR ALSO CONFIRMED FAILURE OF 7TH STAGE BLEED VALVE FOR NOT OPERATING WITHIN MANUFACTURERS