As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CLIMBING THROUGH 300 AGL COCKPIT BEGAN TO SMELL LIKE WET MOLDY MILDEW SOCK. GOT STRONGER UNTIL 8000FT WHEN SMELL TAPERED OFF. GONE Y 23000FT. MAINTENANCE ISOLATED SOURCE OF FUMES TO ENGINE NR 1. PERFORMED WC 7900-2001. NO DEFINITE FINDINGS. PERFORMED VERIFICATION FLIGHT.