What was found
PRESSURIZATION AUTOFAIL AFTER LANDING. GROUNDED - YES. ACCOMPLISHED AUTO FAIL LIGHT ON- FAULT ISOLATION NO FAULTS NOTED REF B737-900 FIM 21-31 TASK 827. ACCOMPLISHED DCPC BITE PROCEDURES #1 CONTROLLER SHOWED NO EXISTING FAULTS 1 FAULT HISTORY OFV LRU FAIL. RESET #1 CONTROLLER NO FAULTS NOTED. #2 CONTROLLER NORMAL NO FAULTS NOTED REF FIM 21-31 TASK 801. PERFORMED PRESSURIZATION SYS GROUND TEST BOTH #1 & #2 CONTROLLERS TEST PASSED. GROUND VERIFICATION TEST PASSED REF B737-900 AMM 21-31-00-700-802. RECHECK DCPU BITE TEST ON BOTH CONTROLLERS NO FAULTS NOTED REF FIM 21-31 TASK 801.