What was found
DURING CRUISE AT FL250 AUTO FAIL ILLUMINATED ALONG WITH ALTN. RAN QRH OPS NORMAL. GROUNDED - YES. ACCOMPLISHED BITE OF NR 1 AND NR 2 DIGITAL CABIN PRESSURE CONTROLLERS IAW FIM 21-31, TASK 801. NR 2 CABIN PRESSURE CONTROLLER SHOWS CODE 050. ACCOMPLISHED FIM 21-31, TASK 824 FOR CABIN PRESSURE CONTROLLER FAIL, FAULT. FOUND COPPER TAPE ON FRONT FACE OF CONTROLLER COMPROMISED IAW FIM 21-31, TASK 824, STEP E.1. R & R NR 2 CABIN PRESSURE CONTROLLER IAW AMM 21-31-01. OPS CHECK NORMAL. DEFECT CLEARED.