As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
DURING CRUISE AT 6000 FT FROM SJU TO STT THE LEFT FUEL PRESSURE WARNING ILLUMINATED. RAN MEMORY ITEMS AND ENGINE SHUTDOWN CHECKLIST FROM QRH AND DECLARED AN EMERGENCY. LANDED SAFELY AND NO DAMAGE TO AIRCRAFT. SUBSEQUENT MAINTENANCE TROUBLESHOOTING DETERMINED THE LEFT FORWARD TANK FUEL INDICATION AMPLIFIER HAD FAILED. MAINTENANCE REPLACED THE AMPLIFIER AND RETURNED THE AIRCRAFT TO SERVICE.