As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRONG ELECTRICAL ACRID ODOR COMING FROM THE LWR LT AFT CIRCUIT BREAKER PANEL. ODOR STARTED 30 MIN AFTER DEPARTURE. SEEMED TO DIMINISH AFTER 10 MIN, BUT ODOR RETURNED 15 MIN BEFORE LANDING AND REMAINED STRONG. REMOVED LT COCKPIT SEAT, LT LOWER AFT SIDEWALL. RAN ENGINES AND FOUND WINDSHEILD DE-ICE LO RELAY TO BE BURNED.