I don't suspect that the task will be hugely difficult, just lengthy, because there's so much fairing to remove. Where most bikes have a fuel tank, my Goldwing has a stereo on the top and an air filter underneath, and it's not easy to get to - that's where I need to go to check the sensor.
But where the gremlin is, I suspect, is inside the main fairing in a bracket on the right side mounted above the radiator fan. To get to it, I need to remove the fairing centre (which reveals the bolts for the fairing upper), then the windshield, headlight, instrument cluster, inner top liners (including the glove boxes) and then the fairing itself.
I've already had the headlight out, I had to upgrade the headlight wiring - the Goldwing brings its headlight (2 x 60/55W halogens) on with the ignition, and one of the previous owners put an ordinary 10A switch in line with the low beam wire and then glued that switch beside the tacho. There are 7 auxiliary switches on this bike - I chose one of those, connected it to a relay and rewired the headlight so that it was driven through a 40A relay instead.
I need to clean the electrics up anyway, there's a bit of mess and the bike is 20 years old - I'd like to go over every connection and give it a clean so that it can do another 20 years!