A couple of years ago we purchased a new side load washing machine. During the wash cycle the pipes bang. I'd like to know, are we getting air in the line or is it the pipes are loose and ones banging against the other? Since I tend to think the pipes are loose I'd like to verify my position before I go in and tear the drywall down to gain access to these pipes. We have no problem anywhere with air in the lines but here. Help!