I have a built in the wall double oven Serial #V657590H catalog #RK7660R3HT. The top oven door has not shut completely for a couple of weeks & then during Christmas dinner the whole oven door came off in my mothers hand!!!! Is there a way it can be put back on-does it just slide back onto the bracketts & how do I tighten it up again so it shuts flush. cannot find this older product on this site.