As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
CREW REPORTS THAT AT PASSING THRU 8000 FT, HAD UNKNOWN FUMES IN THE COCKPIT. DECLARED AN EMERGENCY AND C/W WITH CHECKLIST. RETURNED TO RNO. RAMP UNLOADED AND INSPECTED HAZ CONTAINER ALL OK. REMAINDER OF FREIGHT UNLOADED NO SIGNS OF LEAKAGE. RAN ENGINES AND PRESSURIZED A/C TO 4 PSID PER JRH, NO ODORS DETECTED.