As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON ENGINE START, NR 4 ENGINE WOULD NOT LIGHT UP WITH A & B AND BOTH IGNITERS. T/S DOWN TO FUEL SHUT-OFF LEVER SWITCH TRANSFERRED TO DMI 18678 IN ACCORDANCE WITH MEL 74-1 CATEGORY-C, PLACARD INSTALLED. REPLACED START LEVER SWITCH PER MM 74-00; OPERATIONAL NORMAL. THIS CLEARS DMI 18678. PLACARD REMOVED.