Removal of the front underbelly cover is done by removing the upper five plastic flanged nuts (small flange), the two lower outer plastic flanged nuts (large flange) and two lower (center) stainless steel bolts with washers.
A 10 mm socket is required on an extension and ratchet.
Note: the stainless steel bolts thread into the aluminum frame member behind the underbelly cover. They might be seized. One of mine was seized and it took over an hour to remove using a penetrant and repeated fastening/unfastening of the stainless steel bolt. And because the fastener threads into a blind hole, the penetrant can only be applied between the cover and the aluminum frame member. After it was removed, a M6 bottoming tap was run into the threaded blind hole to clean the threads. White powder (aluminum oxide?) came out. Patience saved the day. The threads of the stainless steel bolts have since been coated with an anti-seize paste.