I fixed the front TPMS.
It had a flat battery. So I followed the procedure outlined on the web of using clamps to break the bead on the tyre and carefully exposed the TPMS. Carefully removed the TPMS and pulled it apart. Pried the battery from the spot welded tabs and soldered a new battery in place. Getting the solder to stick to the old battery tabs was harder than anticipated and in the process I cooked the battery.
Luckily I bought a packet of two batteries. So soldered two thin wires to the second battery which was real easy and connected those wires to the circuit board.
It wasn't until I went to put the TPMS together that I realised that I had the polarity reversed with the wires.
So undid the soldering and swapped the wires around in the firm belief that I had killed the sensor with the reverse polarity.
Did the "swing the sensor around on string" test to see if it showed up on the dash panel of the bike. Nothing
Killed it for sure.
But the sensor back in the wheel, pumped the tyre up and took the bike for a spin.
Imagine my surprise when the dash panel came to life before even getting to the end of our driveway and showed front tyre pressure. I couldn't believe it.
Those sensors are obviously pretty bullet proof. Sweet