As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
WITH BOTH ENGINES STARTED AND AT IDLE, #1 ENG FUEL PRESSURE LOW CAUTION ILLUMINATED. A TEST FLIGHT EVALUATION REVEALED AT IDLE #1 ENGINE FUEL PRESSURE LIGHT DOES ILLUMINATE RIGHT WHEN THE PRIME PUMP IS TURNED OFF. THE LIGHT WILL EXTINGUISH WHEN THE PRIME PUMP IS TURNED BACK ON. FUEL PRESSURE LIGHT WILL ALSO EXTINGUISH AS SOON AS N1 INCREASED ABOVE 74.5% N1, AND IN THIS CASE WILL NOT COME BACK ON UNTIL N1 REDUCED TO ABOUT 66.4% N1.