I don't know of any bike manufacturer that will provide support for routine maintenance so I'm not surprised at Rad's reluctance to wade into this with you. As you've discovered there are a lot of online resources to help do your own maintenance. Most local bike shops will do maintenance for you if you'd rather not get into it.
With that said, as Craigrnelson states most modern bikes use sealed/cartridge style bearings in the bottom bracket. These do not require service until they need replacement after many thousands of miles. Older designs, and perhaps a few modern bikes, used individual bearings in the bottom bracket (cup and cone bearings) that do need routine maintenance.
How to know which style you have? They require a different tool for disassembly. Most modern sealed bottom brackets use a spline tool to remove a cup threaded into the non-drive side of the bike and then the cartridge assembly from the drive side. An older style 'cup and cone' bottom bracket often needs a spanner or pin wrench to remove the adjustable cup. There are other versions of both styles, just to complicate matters! Most bikes also require a crank puller to get to the bottom bracket so most likely two speciality tools!
This graphic compares a cup and cone (left) to a cartridge (right) bottom bracket and the tools needed to remove them. Note that the cranks are still in place but would need to be removed before removing the bottom bracket.
View attachment 66211
Graphic from sheldonbrown.com
When in doubt it's OK to ask your LBS for some advice/help.