As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
FLT 440 PHX-DCA BURNING ODOR. DURING CRUISE, HEARD A LOUD RUMBLING NOISE ALONG WITH ELECTRICAL ODOR. SHUT OFF BLOWER FAN TO OVERRIDE. NOISE AND ODOR STOPPED. POPS BLOWER FAN CIRCUIT BREAKER BEHIND FIRST OFFICER. SWAPPED BLOWER FAN WITH EXTRACT FAN. R & R COOLING EXTRACT FAN. OPS CHECK GOOD.