Picked my Trophy up today following the ECU replacement, and the TPMS doesn't work. The TPMS red light came on and the display said something like "TPMS fault - check manual". Took the bike back to the dealers, and they're mystified. They've (re)paired the TPMS, redone the tune, and all to no avail. They've contacted Triumph who say it must be the transponders, so they've ordered some new ones under warranty.
Seems odd that both transponders have failed at the same time, just as the ECU is replaced, but who am I to argue? Has anyone else had the same issue, I wonder?