Problem stsetch SNF 2010-07-21 18:33:45: Cover interlock occasionally misreads OPEN

Cover interlock occasionally misreads OPEN when venting, causing vent to abort. This happens more frequently when I'm leaning against the chassis or resting my arms on the cover. OPEN signal disappears after I jiggle the lock handle or simply whack the chassis (much like an old TV). Probably something is loose inside.