For those that are interested in doing this, here is a little info.
I did mine this weekend. On the 6020 there are a total of 92 screws that have to be removed to get the back off (not including any wall mount brackets or stand).
The total count including the board is 99 screws. There are 4 different types/sizes of screws. I used the same screw driver bit for all and had no problems what so ever.
All of the screws that hold the back panel on are the same type (of head) and only a total of 2 are longer in size.
There are four screws that hold the side input cover on, 2 are short, and 2 are long.
The input cover panel that covers the board that you will change has different thread types from the ones that hold the back cover on, and the screws that hold the actual board to the panel are a different thread type. But regardless, they are all Phillips head, and I used the same bit.
Just find a bit/driver that fits tight and secure and you should have no problem. When I have time, I will post the size of bit/driver I used (not at home right now). I just wanted to get this out for those that are interested.
The easiest way I found to keep track of all the screws, was to use multiple pieces of packing tape. Lay the tape sticky side up, then as you remove screws; place the screws on the tape. Label the tape for the area you are removing screws. Bottom, L side, R side, Top, Middle, etc., with an arrow pointing in the direction you started for that piece of tape.
So if you start on the bottom left, on the edge of the tape (fold over) and right bottom with an arrow pointing to the direction you started. Remove each screw and place on tape.
Then when you put it all back together, you know where every screw goes, and is the same screw you removed.
It was very, very easy, just time consuming.
As other have said/posted, the ribbon cables have a latch that needs to be lifted up to remove the cable. The only one that doesn't is the PC input board ribbon cable that just pulls straight up to remove, and is pushed straight down to reinsert.
I bought my board from Pioneer, and got here (AZ) in two days.
Hope this helps someone who is wanting to do it.
I went the extra step and bought the ControlCal software and unlocked the isf day/night modes.
The swap is worth it for the Pure mode alone, but having the isf day/night modes is even extra motivation to do the swap.