What was found
CLIMBING THROUGH FL300 WE HEARD AN OSCILLATING/BUZZING SOUND COMING FROM BEHIND THE GLARESHIELD LEFT SIDE. SHORTLY BEFORE LANDING, THERE WAS AN ASSOCIATED UNUSUAL SMELL. THIS MATCHES WITH A PREVIOUS WRITE UP. REMOVED LEFT GLARESHIELD COOLING FAN (MC001) FOR OSCILLATING/BUZZING, INSTALLED A NEW UNIT IAW MM 21-25-05, OPS CHKD GOOD.