What was found
STRONG ELEC BURNING ODOR, FOLLOWED BY LT RECIRC FAN CAS MESSAGE ODOR, ODOR DISAPATED WITH FAN OFF. DEBRIEF WITH CREW, NO SMOKE JUST ODOR WHEN EICAS MESSAGE CAME ON AND LT RECIRC FAN OFF ,ODOR THEN DISSIPATED NO EVIDENCE OR SMOKE OR ODOR DURING THE REST OF THE FLIGHT WHEN LTT RECIRC FAN WAS OFF , LEFT RECIRCULATION FAN MAKING HUMMING NOISE AND FAN NOT SPINNING & C/B FOR FAN TRIPPED P36 APPROVED PERFORMED PHYSICAL AND VISUAL INSPECTION OF FAN APPLIED MEL DDP C/W. R & R LT RECIRCULATION FAN IAW AMM 21-25-01-004-001, 21-25-01-404-019, PERFORMED INSTALLATION STEP UP TO AND INCLUDING STEP 3.F(6)(D). COMPLETED INSTALL TO END IAW AMM 21-25-01-404-019. OPS CHKD GOOD.