As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WHILE ACCOMPLISHING PZTC BITE, FOUND FAULT FOR LH PACK EXIT SRADA. GROUNDED - YES. #1 PZTC REPLACED, REF LOG 60238059, FOR HISTORY OF "DEAD" AND OTHER FAILURE MESSAGES. ACCOMPLISHED MEL 21-5D RESTORATION PROCEDURES PER B737-900 AMM 21-00-00-440-802. RAM DOOR INLET AND EXIT ACTUATORS RETURNED TO NORMAL CONFIG. GROUND VERIFICATION, #1 PZTC INSTL TEST PASS, BITE TEST NO FAULTS AMM 21-61-01-400-801.