Installation was reasonably straight forward.

You'll need:

• Soldering iron - I'm using old faithful Jaycar Duratech TS-1554 20W/130W
• Solder - I'm using cheap 0.5mm Sn 63 / Pb 37 / Flux 1.2
• Flux - I use a pen
• T6 Torx screwdriver - I have one of these sets

Steps:

• Remove bottom battery/breakout board
• 2x T6 Torx screws hold the PCB in place
• Slide speaker out (careful of it's thin wires - I broke mine)
• Slide PCB sideways and lift slightly. The display ribbon cable prevents it from being fully removed
• Push the display + bezel from behind to detach it from the case
• Remove the bezel from the broken TFT
• Rotate the PCB 45 degrees and remove from plastic shell, to avoid damaging it
• Flip TFT 90 degrees revealing its flexible cable
• Detach the TFT by applying a little flux + solder and gently prying while heating the pins with a soldering iron
• Apply flux to the solder pads and stroke each with a soldering iron to create a smooth finish. There should already be enough solder remaining, if not, add a tiny bit more and stroke smooth
• Place the new TFT over the pins and precisely hold in place with your thumb while applying power to check the display works
• Solder pin 1, check alignment and adjust if need be
• Solder the remaining pins. Get some bright light and a magnifying glass and make sure none of the pins are bridged. Or use continuity mode on your multimeter to check adjacent pins
• Insert the PCB + new TFT back into the plastic case, slide PCB sideways and attach Torx screws.
• I accidentally detached one of the speaker wires earlier, so with the new TFT flipped out of the way, resoldered the speaker wire.
• In doing so, I detached the other speaker wire! So I swapped both for new thinker wire, salvaged from a Dupont ribbon cable. The wire can't be too think as it needs to sit between the TFT and PCB.
• Reseat the speaker
• Sit the TFT in place and remove the protective cover (green tab) being careful not to touch it with your oily fingers
• Remove the sticker from the back of the bezel and insert the 3 plastic buttons
• Attach the bezel onto the plastic case and press firmly
• Plug in USB and boot
• Press 3 push buttons to cycle through RGB colours
• It works!

The screen is a custom design and to buy a replacement I need to order 13x the $1 USD custom made order:
https://www.aliexpress.com/store/product/M5Stack-Special-Link-for-Custom-Made-Order/3226069_32844904816.html

Which works out roughly $17 AUD and is about 30% of the price of a new unit.
Might just use this one for spare parts and order a new one.

Back of the screen says "FW-TFT020 YSH 2017-09-25"