As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: 4L DOOR SLIDE BOTTLE PRESSURE INDICATES AMBER IN FLIGHT. MAINTENANCE FOUND FAULT MESSAGE FOR DECODER ENCODER UNIT (DEU-B, 300RH8) AND REPLACED IT PER AMM 23-73-47. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO FAULTS NOTED.