Thanks to all who replied. I did manage to find a simple step by step set of instructions on how to disassemble the TO. It's done. Volume control is now smooth and static free. The band switch has shown some sign of improvement, but is a bit noisy between switch functions. Not sure if this is normal. The over all improvement is at least when a band is locked in with the switch, the band reception is solid versus intermittent like before. I'm thinking maybe more in depth cleaning of the band switch would be in order.
Mine all make at least a thump through the speaker when switching bands. You can't clean it too much but I would be a little hesitant to put anything like a brush down in there to help it along. Be advised that the cleaner (DeOxit D5 or equivalent) will get on the coils and mess up the alignment for a few days until it all dries out.
There are many fairly recent threads about the various Royal series here and in the Transistor Radios forum. The search function seems kind of hit or miss but dig around and you can find them.
While you have it apart, be sure to also clean up the transistor leads and sockets, and I expect you would be doing yourself a favor by replacing the electrolytic caps. I think all of the Royal 3000s I have worked on had at least one of the "white ceramic tube" electrolytics and absolutely every one of them I have ever tested was dried out completely. The black one that are sealed with resin are frequently OK, but you never know. All the other disc or tubular caps are usually just fine and there have been no wax/paper caps in any of mine, even the very early 1000s. Only replace any of the other parts if you know they are bad.