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I had to replace that PC board on mine several weeks ago. You don't have to remove the whole fan assy. It can be replaced from below.
Remove the screen by turning the plastic tabs that hold it in.
Remove the knob (screw in the middle).
There are several screws around the edge that hold the escutcheon in place - remove them. The PC board is now visible.
Remove the (two, if I remember correctly) screws that hold the PC board in place. The board will now be free.
There are 5 or 6 inline connectors and PC board mounted connectors to disconnect. Be careful as you disconnect them, one of them is connected to a small, thin wire that can be damaged. The only trouble I had was pulling the cables out of the space between the fan housing and the ceiling cut out - they were just stuffed in there to take up the slack, and they were tight to get out. The only other thing to be aware of is that one of the sensors and one of the small wires is hot glued into place. You will have to re-glue these.
It's not as bad as it sounds - just go slow and be sure to disconnect/reconnect all the cables to the board. The connectors are all different size/configs, so you can't get a cable in the wrong place. Re-stuffing the cables back into the void to get them out of the way was probably the worst part.
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