At 2:30 this morning, after I started Ruby at the Shell ready to depart on my FarRide to Bargara, the FI light came on.
Last time it did that was after a brake pad change, and it resolved itself after a restart. IanB (ex Beatup) had a similar problem that his Honda mechanic couldn't fault. So I pushed on into the night. I did two rolling shut down/ restarts to no avail. It was only after a complete shut down when I refuelled the next time that it reset itself. I've had five starts since without a problem.
Danged electrickery! I've been interfering with Ruby's intestines with the grip heater install and driving light repair, but none of that should have upset the ECU. The only possibility I can think of was I may have cranked the starter before the FI extinguished in the boot cycle, but I'm sure I've done that plenty of times with no ill-effect, even though it's best practice to wait.