What was found
(CAN) THE CREW NOTICED A FAINT ELECTRICAL ODOR. THE ACFT WAS DIVERTED AND LANDED SAFELY. EMERGENCY SERVICES RESPONDED, BUT FOUND NO INDICATIONS OF FIRE, HEAT, OR SMOKE. THE OPERATOR REPORTED THE FOLLOWING: THE CREW RECEIVED A LT BLEED DUCT WARNING EICAS MESSAGE, A F/A OBSERVED SMOKE IN THE CABIN, PASSENGER O2 MASKS WERE DEPLOYED. PRELIMINARY FINDINGS FROM MX TROUBLESHOOTING ARE THAT THE PRE-COOLER WAS FOUND CRACKED.