[COFF] DECmate-II and WPS-8

A friend of mine has a DECmate-II word processor. It is in perfect working order except for one thing. The field encoding the current date/time has overflowed. It is impossible to set a date/time in the 21st century. He says that the software in question is a version of WPS-8 for the PDP-8. It should be possible to fix the date/time problem by dumping the DECmate's ROM and disassembling the code. It ought not be too hard to locate the date/time encode/decode routine and come up with a fix to the time epoch problem. Is anyone out there familiar with the DECmate-II software? Or, even better, knows how to get its source code? Advice greatly appreciated. -Paul W.