I run a Titan 575. I get a whistling sound coming from the blower when I start the truck in the morning. It only happens on my first job. It's been diagnosed that I need to lubricate the ceramic bearings in the blower, which is not done from the lube port in the front. The manual doesn't show where the ports are to apply the lube in the back. Can someone point me in the right direction, as well as recommended lubrication? I've been told everything from bike chain grease to WD-40. Very little information about this online. Thanks!