As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: DURING A SCHEDULED REPLACEMENT OF THE R4 DOOR SLIDE, THE REPLACEMENT SLIDE INDICATED LOW PRESSURE ON THE FLIGHT ATTENDANTS PANEL. MAINTENANCE DETERMINED THE REPLACEMENT SLIDE WAS BAD FROM STOCK AND REPLACED IT WITH A SERVICEABLE UNIT. THE BAD FROM STOCK SLIDE WAS ROUTED TO BE SENT OUT FOR REPAIR.