As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
PWM-On take off roll, LH Fuel Fire-wall S/O Valve light in handle illuminated. Amp Detect (LH Side) fails to illuminate the fire-wall Fuel S/O valve handle. Take off was aborted, aircraft returned to gate. MX found no eveidence of fire. Trouble shooting of system revealed Amp and Loop test portion inop. R&R LH Engine Fire Loop Detector. OP's check good. Aircraft returned to service.