2004 F150 Digital Odometer Shorting Out

The odometer on this truck started shorting out a couple years ago and now is off most of the time. I saw a video on youtube where a guy with the same truck went under the dash and found the wire loose and fixed it. He said it was common for that particular model – lucky me. I’m not too good getting under the dash and finding a loose wire and can’t find the same video to get tips how to do it – any help would be appreciated – I’d like to get the odometer working.