[CR] Overhauling a Stronglight sealed BB?

I have a Stronglight 650 sealed bottom bracket with the titanium spindle like this one:

http://homepage3.nifty.com/ClassicBicycles/brands/stronglightNo.650bb.html

The threads are crisp and clean so I think the unit is in good shape, but because it's over 20 years old I'd like to pack it with new grease. Are these bottom brackets serviceable? Or are they disposable like modern sealed units?

Thanks,
Greg Weiner
San Francisco, California
USA