What was found
PHL FLT 1020 EN ROUTE PHL TO MCO. SHORTLY AFTER T/O, PASSING APPROX 9,000, COCKPIT FUMES OF RUBBER TYPE SOURCE WAS EXPERIENCED, 4 TO 5 MIN LATER RECEIVED EMERGENCY EQUIP EICAS MESSAGE. THE COCKPIT CREW DONNED THEIR OXYGEN MASKS, AND DECLARED AN EMERGENCY WITH ATC. THE FLIGHT RETURNED TO PHL AND LANDED WITHOUT FURTHER INCIDENT. MAINTENANCE REPLACED THE EQUIPMENT COOLING FAN. VENDOR SHOP FINDINGS: UNIT PASSES ELECTRICAL TESTS. APPEARS TO HAVE INGESTED FOD. CARBON AND BURNT FOD ON IMPELLER AND FAN HOUSING. IMPELLER BLADES NICKED AND BENT. ROTOR DIMENSIONS OUT OF TOLERANCE. CHIP MISSING FROM BEARING SEAT ON ROTOR SHAFT. END BELL BEARING LINER DAMAGED.