As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
RETURNED TO ANCHORAGE DUE TO STRONG ELECTRICAL SMELL. FOUND ALTITUDE ALERT (A)-1 LIGHT ASSEMBLY DARKENED FROM OVERHEATING OR SMOKING. FOUND C/B C318 TRIPPED. MASTER DIM BUS INDICATOR SECT 6 INCHES REPLACED KORRY LIGHT ASSEMBLY & RESET C/B. OP CHECK GOOD REF: B737-200AMM 22-11-001-5-1.