As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS NOT GROUNDED: L2 SLIDE PRESSURE ON FLIGHT ATTENDANTS PANEL DISPLAYS LOW PRESSURE MESSAGE AND IS ORANGE. MAINTENANCE REPLACED THE "B" DECODER ENCODER UNIT 300RH4 (DEU) AND ACCOMPLISHED A SATISFACTORY OPERATIONAL CHECK PER AMM 23-73-42.