As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
SUPPLEMENTAL FUMES AND SMOKE IN COCKPIT. JUST LEVELED OFF AT FL250 WHEN WE SMELLED SMOKE AND FUMES SMOKE WAS VISIBLE FOR ONLY A FEW MINUTES. C/A-FOUND #1 ACM INOP AND DAMAGED (INTERNAL DMG) DEFERRED #1 PACK IAW MEL 21-30 AUTH 061116D-C. FOUND DTCV TO HEAT EXCHANGER DUCT BLOWN OFF AT DTCV. REATTACHED DUCT IAW ETN-EM-21-056 OPS CHECK OK IAW AMM 21-51-00. MEL RESTORED