02 Sierra 2500 instrument cluster issues

[Richard Carrino]

Got an 8.1 02 Sierra 2500HD that’s been having issues with instrument cluster for a few months now. Whenever I hit a bump the dash resets as if something is loose. All the indicator lights come on and the needles drop and readjust. This started happening after the fuel lines were replaced. I read somewhere it could be a loose ground but I can’t find the thread anymore. I’m guessing something was knocked loose during the repair? Cluster works fine otherwise.
Anyone with some experience or input on this issue? 

[Formulabruce]

Cold solder joints on the bulbs and the motors. There is a cluster ground behind it as I recall. Only take a couple min to yard it out and see.

[Richard Carrino]

On 5/31/2020 at 11:41 AM, Formulabruce said:

Cold solder joints on the bulbs and the motors. There is a cluster ground behind it as I recall. Only take a couple min to yard it out and see.

Once I remove the cluster from the dash do I then disassemble it to reach the ground? Not too familiar with this. 
It worked with no issues Saturday the Sunday I turned the truck on and it was out again. Could it be the cluster itself? 

[Formulabruce]

It does need to come apart. If you have doubts, a guy on ebay from CT. rebuilds them