As reported to the FAA. Reports are unverified, and codes are left as the FAA publishes them.
What was found
AIRCRAFT WAS GROUNDED: MID F/A REPORTED A STRONG ELECTRICAL SMELL IN THE CABIN."R RECIRC" UPPER EICAS MESSAGE ILLUMINATED AND INOP ANNUNCIATORON R RECIRC SWITCH ILLUMINATED. REMOVED AND REPLACED CABIN AIR RECIRC FAN AND FILTER ASSY IAW AMM 21-25-01 AND 21-25-02.