>>2054756
if you think the issue lays in the electronics stored under the footpad, first off buy one of these spray contact cleaners, they are not conductive and fix 80% of corroded electronics i come across.
to troubleshoot the shit:
1. IMPORTANT, unplug the motor hub from the battery, the battery is located under the footbad, just unscrew the panel and gently pull out the connector of hub motor cable from the controller board next to the battery. do it gently otherwise you risk breaking the connector, it shouldn't be soldered into the controller board but if it is let me know.
2. check the wire coming to the motor hub for rips and tears underneath or protuding from insulation, if the insulation is broken there might be a short in the wire caused by water intrusion. if the insulation is broken, unplug the motor hub from the footpad battery and just put on a heat shrink on it or if two cables are broken and are causing a short with eachother, pull those individual cables (do it one at a time), cut it where its broken, put a heat shrink tube on it (do it first before soldering) solder a bit of wire of similar thickness so its slightly longer than it originally was, solder it back together, heat shrink the insulation and put it back together with more insulation if its needed. buy a multimeter, its going to make checking for ruptured or shorted connections really easy.
3. check the motor hub for corrosion, there are tutorials online on how to deal with hub motor corrosion, as it comes to corroded electronic components in the hub motor, the pic-related spray should fix the issue and if it doesn't, you gonna have to jump traces on the PCB board or replace $0.20 worth of components if there are any, of course that requires a soldering iron and soldering skills, if you want to jump a trace just use a multimeter to check connections and if one of them are broken, scrape the PCB with a knife and jump it with a piece of wire.