Sorry Bees, I misread your post. You said you use to lift the lid to let it down. When I read your post I thought you still did. It sounds like the pin that holds the hinge verticle is missing. You can lift the front of the stove top about ten inches. pull the stove top toward you and remove the stove top. You will now be able to see the hinge of the stove cover. You will find that the stove cover has a c shaped cutout in the hinge. This is for a pin to slide into to hold up the cover. The pin is probably pulled out. you can replace it with a small screw and jamnut.
1998 Pace Arrow 35 ft. F53 Ford V10 2012 Honda Civic toad
15 year motorhome service manager. 3 popups....2 travel trailers....5 motorhomes....loved them all.