Slicing open the top of a 48T02 Sun Sparc chip to replace battery is that thing hollow or filled with epoxy?

Hi I am considering slicing open the part epoxyed to the top of a 48T02 chip to replace or hook up a new 3VDC source. I dont wanna buy a new chip.... My plan is to use a Dremel type cutting wheel and do a "lobotomy" on the module fitted on top of the chip. Then, either connect a new 3VDC source to this (2 alkalines in a battery holder) or simply replace the cells inside. If the thing (the top module with the batt and osc) is not filled with epoxy I imagine this can be done...does anybody know if that module is "hollow" and removing the top will reveal the components inside...??? Or will I just be cutting through solid plastic/epoxy??? Other method would be to slowly grind top of module until components inside are revealed... Alternative method is revealing the wires coming from top part to chip by digging into epoxy on one side and hooking up there (from sun NVRAM faq)... Thanks Claude