I BOUGHT A USED WL660800AJ AND THE TOP LID WONT CLOSE. UNDER FURTHER INVESTIGATION, IT IS POSSIBLE THAT THE RISER PIPE COMING OUT OF THE TANK ZLONG WITH (2) GUAGES MIGHT HAVE BEEN REPLACED BECAUSE THERE IS NO CUT OUT IN THE LID FOR THE HORIZONTAL PIPE BETWEEN THE UPPER GUAGE AND WERE THE PIPE CONNECTS. PLUS THE HOLE FOR THE ON-OFF SWITCH IS SMALLER THAN THE BACKING BEHIND THE ACTUAL SWITCH. AM I MISSING SOMETHING?