First off, remove the belts, turn inside out and look for any debris stuck into the grooves and on the grooves in the pulleys as this can cause squeaks. Then (This might sound a little unlikely.. but) try spraying Windex on the belts with the motor running, the noise(s) will disappear initially as the Windex acts as a lubricant but it will gently degrease the belts and pulleys. The noise will probably return with a vengeance initially but then fade. repeat this a couple of times. Whatever you do, don't use CRC belt grip as it makes things about 10 times worse and is pretty much irreverseable! Good luck.