As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PSC - AFT TWO RED FLOOR TRACK LIGHTS AT ROW 1 INOP. COMPLIED WITH TROUBLESHOOTING, FOUND 2.3 VDC AT 3352-4F20. SWAPPED BATTERY PACK AT PS6 (3352-P52), NO HELP. CLEANED CONTACTS AND POWER SUPPLY P56. OPERATIONAL CHECKS GOOD. NO PARTS REPLACED. AIRCRAFT RETURNED TO SERVICE.