As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
NO LAND 3 EICAS MSG APPEARED FOLLOWED BY NO LAND 3 STATUS MSG AND FLAP/SLAT ELEC STATUS MSG. ALSO OFF FLAG APPEARED IN CAPT'S STAB TRIM INDICATOR. FLAP/SLAT ELEC STATUS MSG DISAPPEARED ALONG WITH OFF FLAG IN STAB TRIM IND. NO LAND 3 MSGS REMAIN UNLESS AUTOPILOT IS DISCONNECTED AND RECONNECTED. THEN IT ALL HAPPENS AGAIN. FOUND P6 J-19 C/B 28VAC BUS L GLOWING RED AND SPARKING. REPLACED SAME, RAN MCDP TEST 40, ALL CHECKS NORMAL. OK FOR SERVICE REF WDM 24-53-11 PG 7.