Front overhead cabinets dropping down.

After 15 years of rough riding, our front overhead cabinets are starting to loosen and slightly drop down. I want to tighten the screws/bolts holding them to the ceiling but the false tops inside the cabinets prevents finding them. Anyone have pics to show exactly where they are before I start looking? 2002 Bounder 31W.
I replaced the front TV with a flat screen a few years back so at least the extra weight of the old CRT television isn't a concern.