As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
ORD - FLT 1701 - AFTER TAKEOFF, CLIMBING THROUGH FL 220, STRONG ACRID ELECTRICAL FUMES REPORTED IN COCKPIT. EMERGENCY DESCENT AND LANDED ORD WITHOUT INCIDENT. INSPECTED ALL COCKPIT INSTRUMENT PANELS AND WIRING. COULD NOT DUPLICATE. SYSTEM GROUND CHECKED, NORMAL OPERATION. (X)