As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
STRANGE ODOR AT CRUISE ALTITUDE. EMERGENCY LIGHTS TRIGGER ON, RIGHT STAIR LIGHT WAS OUT. EXERCISED A PRECAUTIONARY LANDING. TROUBLESHOT EMERGENCY LIGHTS AND FOUND NR 2 FORWARD EMERGENCY POWER SUPPLY TO BE DEFECTIVE CAUSING LIGHTS TO ILLUMINATE & RIGHT STAIR LIGHT OUT. REPLACED THE POWER SUPPLY IAW MM 33-52-01. OPS CHECKED GOOD.