As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW NOTED FUMES IN COCKPIT WHILE LEVEL AT FL350. REMOVED AFT ECU ASSEMBLY. REMOVED ACM FLAN AFT ECU, WORK DONE PER MM 21-51-00. REMOVED S/N: 200012231 1607.3 HOURS 942 CYCLES. REMOVED AFT ACM COALESCER CLOTH & CLEANED PER MM 12-10-01. INSTALLED ACM/ECU, RAN APU & BOTH ACM OPS CKS GOOD. WORK DONE IAW MM 21-51-00