What was found
98-0143, STA-TPE, LOSS OF CABIN PRESS CLIMBING TO FL310. CABIN PRESS CONTINUED TO CLIMB PAST 10000 FT. AUTO PRESS WAS INEFFECTIVE A DESCENT WAS BEGUN AND MANUAL PRESS BROUGHT PRESS BELOW 10000 FT. UPON DESCENDING BELOW 18000 FT FLIGHT REMAINED IN MANUAL PRESS MODE. A/C RELEASED FOR SERVICE PER MEL/CDL 21-44. PERFORMED THE CPC 1 AND 2 TEST FOUND CPC NR 1 TEST FAILURE. TRIED TO REPLACE WITH NEW CONTROLLER, NO HELP. ITEM DEFERRED PER MEL 21-44. C/B PULLED. NR 1 CPC BITE TEST SHOWED TORQUE MOTOR CONTROL FAILED, THE ORIGINAL CPC WAS REINSTALLED.