From my experience it sounds like a bearing when I have rode wheels with cup and cone bearings and they have developed a small bit of play or needed greasing, they have developed a click and a creak, check to see if there is any side to side movement of the wheel, also try spinning the wheel with your ear to the saddle, you will soon hear what is going on and if its running rough. I even developed a click from my front, same type of bearing when I hit a speed bump hard, it started clicking, but removing the wheel and refiitting it stopped it.
Alternatively it could be spoke tension or a loose spoke, so have a pull on your spokes to see if any are loose. A broken spoke will make a clicking sound, but the LBS should have spotted it.
And another cause of a clicking sound on a wheel can be caused by the rubber sprues on the tyre from when it was moulded, it can drive you mad to find that one. I serviced a girls bike at work and she had that problem, despite the fact its nothing, I had to cut every one of the little sprues off
Also a click can develop (but no creak) if your magnet hits the sensor if you have a computer fitted, My Mavic Axiums are notorious for this, halfway through a ride, the spoke will twist and ends up making the magnet cockeyed.
The big question is though, is the click and the creak related or two different problems, Clicks normally happen when something is turning, creaks happen when load is applied to something.
Alternatively it could be spoke tension or a loose spoke, so have a pull on your spokes to see if any are loose. A broken spoke will make a clicking sound, but the LBS should have spotted it.
And another cause of a clicking sound on a wheel can be caused by the rubber sprues on the tyre from when it was moulded, it can drive you mad to find that one. I serviced a girls bike at work and she had that problem, despite the fact its nothing, I had to cut every one of the little sprues off
Also a click can develop (but no creak) if your magnet hits the sensor if you have a computer fitted, My Mavic Axiums are notorious for this, halfway through a ride, the spoke will twist and ends up making the magnet cockeyed.
The big question is though, is the click and the creak related or two different problems, Clicks normally happen when something is turning, creaks happen when load is applied to something.