What was found
AUTO FAIL PRESSURE LIGHT IS ON WITH ALTN LIGHT NR 2 (FWD) CONTROLLER LOGGED THE FOLLOWING FAULTS: (1) CADC NR 1 INV (2) ALT NR 1 INV (3) AS NR 1 INV (4) CORALT NR 1 INV (5) GROUND MODE. DUE HISTORY IF THE NR 1 CPC AND FMC'S 1 2 DO NOT HAVE THE SAME AIRDATA FAULTS WHICH ARE ON THE SAME DATA BUS THEN REF WDM21 31 24 PG 2 SUGGEST CHECK WIRING TO NR 2 CPC FROM TB1111 YA1 ANDYB1 LOOK FOR INTERMITTENT CONTACT PROBLEMS. UNABLE TO DUPLICATE OPS CHECK GOOD AT BOTH CABIN PRESSURE CONTROLLERS. REMOVED AND REPLACED NR 1 CABIN PRESSURE CONTROLLER IAW BOEING AMM21 31 01. OPS CHECK GOOD. PRECAUTIONARY AND RANG OUT WIRING FROM CPC NR 2 TO TB1111 YA1 ANDYB1, NO DEFECTS NOTED.