As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLIGHT 1603 - PHL TO ORD, -SLAT LO RATE- EICAS MESSAGE INFLIGHT, SLAT ACE 1 AIRCRAFT POWER C/B TRIPPED. FUMES IN THE COCKPIT 80-100NM WEST OF PIT. THE CAPTAIN DECIDED TO DIVERT TO PIT. REMOVED AND REPLACED SLAT FLAP ACE. OPERATIONAL CHECK OF SLAT/FLAP ELECTRONIC SYSTEM IS GOOD.