this should be along the Neptune lineup of assembly......there should be 4 screws inside the door well, 2 on the hinges, and two on the opposite side, for if the door should be reversed...
once removed, lift the door up slightly and remove.....then grab the two uprights where screws were removed, and a light twist towards the outside should release the front panel, tilt forward and lift off......
then there should be two bolts near the top, remove these to allow you to lift the whole top up and out of the way on hinges....
more bolts on the front bulkhead will allow you gain access for belt or roller replacement and access to the blower or motor.....
hope this helps......