What was found
PASSING 11,000 FT ON CLIMB-OUT, GOT EXCESSIVE CABIN ALTITUDE ECAM WARNING. CABIN ALT WAS 10170. FOLLOWED ECAM AND QRH. NO FAULT LIGHTS COULD GET OUTFLOW VALVES TO CLOSE IN AUTO OR MANUAL. AIR TURN BACK TO KMEM NO DEFECTS NOTED. AS PRECAUTIONARY SUGGEST CHANGING BOTH CABIN PRESSURE CONTROLLERS. REMOVED AND REPLACED NR 1 AND NR 2 CABIN PRESSURE CONTROLLERS IN REFERENCE TO A310-200 M/M 21-31-11-4. TESTED IN REFERENCE TO A310-200 M/M 21-31-00-5-01 NO DEFECTS NOTED.