Today, just for fun, I tried just about every button combination which I could think of while powering up my 9500ci. We all know, as documented in the instruction manual, that you can hold down the VOL and SENS buttons while powering up the 9500ci in order to reset it to its factory default settings.
Here is one button combination which I can't find any documentation for:
Holding down the SENS and MRK buttons during power-up caused the 9500ci to briefly display 'ERASE?'. I tried this twice and decided, what the heck and pressed the mute button while 'ERASE' was being displayed. The 9500ci displayed 'ERASING' for several seconds and then went blank. I waited several seconds and then pressed the power button again, after which my 9500ci started up as usual. I figured that I erased all marked locations, but since it took so long, I wonder if I erased the RLC database as well? I am away from home at the moment, so I have no real way of checking until tomorrow when I can hunt down a couple of known RLC intersections.