No need!
Leave it on it's stand.
Remove the back - carefully. Don't let it drop onto the neck of the tube!
You'll need to unplug the subwoofer on the RHS - one plug on a loose lead.
Unthread the mains cable and get rid of the back cover.
I always remove the tube base PCB - not essential but easier.
Begin to slide the chassis out, again carefully.
You'll see a plug on the LHS at the front of the PCB which needs to be disconnected, 2 black wires. Unclip the wires which run along both sides of the chassis, yellow/white on the LHS, lots of blue on the RHS.
The chassis will now lift to the vertical position on the RHS, resting on the base of the set/stand and against the back of the tube. Secure it as best you can. You can now access the solder side of the PCB.
Do not use a solder sucker! It will remove the print from the PCB. Use solder 'wick' or 'mop'. (A braid type solder remover). Unsloder all pins, including the 4 lugs at each corner. Remove the old module. Slot the new one in. Resolder it back into place.
Put the old girl back together - don't forget the tube base PCB, the plug on the LHS or the Subwoofer, or to thread the mains lead through the back cover.
Power it up.
Crack open a beer.
Enjoy.