Removing the diffuser exposes the LED PCB. The edge of the WiFi board can also be seen with the antenna protruding.

Note the silicone adhesive on the tabs. You probably don't need to replace this with fresh adhesive, but if you do, make sure it's rated for high temperatures.

On the LED PCB, you can see the white and colored LEDs. The PCB is a thermally-conductive aluminum material.

Around the edge of the bulb's case there is a plastic retaining ring attached by four Phillips-head screws. It's not necessary to remove this for further disassembly.

The LED PCB has a pin header that connects down into the WiFi board. A thermal adhesive pad holds the PCB to the metal bulb case. You can gently pry around the edge of the PCB until the adhesive releases, and the connector separates.

On my bulb, the PCB was not fully-seated on the thermal pad, potentially causing heat-related intermittent faults.