I too doubt any damage. I lost pressure probably 1/2 dozen times before I figured out my problem. It only lasted a few seconds each time. My problem was no baffle in the oil pan. Changed pans no further problem. Mine gave noticable clanging as the pistons flopped around. No noticeable damage on mine so yours should be fine. Just broken in a bit quicker than you might have planned. I think the cool brew is the right place to start on this one!
