A VIBRATION WAS REPORTED WHILE USING THE MANCAGE FOR THE EAST PORTAL. IN ORDER TO CORRECT THIS, THE CAGE WAS TAKEN OUT OF SERVICE FOR OVER 30 MINUTES. DURING THE INSPECTION, IT WAS FOUND THAT SOME BEARINGS AND WHEELS NEEDED ADJUSTING OR REPLACED. TOTAL TIME DOWN WAS FROM 6-10 AM THE SAME DAY.