As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ON APPROACH TO PHL AT 6000 FEET AND 20 MILES WEST THE FLIGHT CREW RECEIVED A TCAS RA. THE FLIGHT CREW INIATED A DESCENT TO 5400 FEET WHERE THE TCAS RA ALERT CLEARED. ATC WAS CONTACTED AND THE FLIGHT CREW WAS ADVISED THAT THERE WAS NO TRAFFIC IN THE AREA.