I just purchased a Canon Pixma iP4500 last Friday. 1) When a roller will run during printer head cleaning, I hear a squeaking sound on the right side. Any known cause or solution to this (e.g., lubricant). 2) That little panel above where the paper ejects (says Canon on the front). Is that supposed to be able to flip down? In addition, does that panel not "lock in" tight? (e.g., sits a little loose) Just want to know if this is normal or if I have a defective unit. Thanks.