DIY FSS B w/ reset on 98 E320 will it void warranty?

In what cirumstances is the MB warranty voided (and how long and what does it exactly cover)? Some have suggested for example "when you reset the service light the info isn't recorded into the computer, but if the dealer uses the factory tool then the reset is recorded into the computer. If you have any warrenty engine repairs this might be a factor." Is this true? The car has 1000 miles to service light on now w/ about 26k mile total. It is being put into hybernation for about a year and a half with only very light use in between to keep things lubricated. Considering doing what is included in the FSS B myself and resetting myself. Is this a good idea any comments??