Have one that flops open you can have - but tabs into main part are gone, if you want that or may be same problem. Un broken do come up on ebay.
If you have tabs then - glue with qbond and powder that beefs up the plastic or some other repair might work. Only a couple of screws to drop panel out.
Used isopropyl alcohol to clean up the rubbery gunk with a metal pan scrubber and it worked very well last weekend. Let it sit for a few minutes.