I'd go ahead and replace the FETs anyways. The ones you buy through AM are of higher quality, and while your at it might as well double stack it. Liths will stress FETs more anyways. A lith xmod with a normally FET safe motor will still burn them if it's pushed hard enough. May not be externally damaged in the normal way that a motor would do, but the liths may have done a number on them internally.
I remember what caused the steering problems. It was while I was building my S10 Crawler, and had to rewire the servo motor back on. The Trucks used a split-apart servo, where the motor and pot were not packaged together. I had wired the servo motor backwards, so when it turned on to center itself, instead of going say for instance to the right, it went left and the pot just kept feeding it to go right (which of course, was left).
Why your's has done this now, not sure. But again, may have to do with the damaged board.
__________________
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