What was found
AIRCRAFT WAS GROUNDED: ON TAKE OFF AT APPROX 1,500 FT RECEIVED A CABIN PRESSUSRIZATION 1 AND 2 FAILURE. LEVEL OFF AT 9000 FT. DID PROCEDURE BUT COULDT CONTROL PRESSURIZATION IN MANUAL. IN MANUAL PRESSUARIZATION WITH AUTO THROTTLE OFF THAT PRESSUARIZATION WOULD FLUCTUATED PLUS AND MINUS 2000 FPM. RETURNED TO LIR ACCOUNT CABIN PRESSURIZATION FAILURE. EMERGENCY DECLARED. ***SUPPLEMENTAL ACTION: REMOVED AND REPLACED #1 AND #2 CABIN PRESSURE CONTROLER IAW AMM 21-31-34. ALL TEST GOOD. OK FOR SERVICE. ALSO SEE AALA202002289011.