As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
(LOG 8800844) EQUIPMENT COOLING EXHAUST NORM OFF LIGHT ILLUMINATED SMELLED SMOKE IN FLIGHT DECK OVHT HORN SOUNDED DURING TAXI OUT. RMVD AX POWER BREAKER PER B737 AMM 24-21-41. R/R P91 RIGID BUS ASSY PER B737 AMM 24-21-22. PERFORMED A/C GEN AND CONTROL SYS TEST PER B737 AMM 24-21. NO FAULTS-EQUIPT COOLING CKS OK. REF B737 AMM 21-27, NO SMELL NOTED.