As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: EMERGENCY LIGHT TEST FAILED. FAULT CODE: 335138 EPSU(10WL)FWD L/DEU-B(300RH1) DISPLAYED. MAINTENANCE FOUND THE R1 DOOR SLIDE / RAFT WAS CAUSING THE FAULT MESSAGE AND REPLACED THE SLIDE RAFT ASSEMBLY PER JOB CARD 26L00025001. A SATISFACTORY OPERATIONAL CHECK WAS ACCOMPLISHED WITH NO FAULTS NOTED.