Depth finder is all messed up.

Took the boat into the shop to get a simrad auto pilot installed. Launched the boat and now the the 3 in 1 depth finder is not working. It’s a simrad nss evo3s. Was working perfectly before bringing it in. At first it wasn’t reading anything, so I went into the settings and noticed it was set to ch1 but the transducer is on ch2. Corrected that but now it’s ultra glitchy and slow, not grabbing depth or producing a clean picture. Would this be an issue with the nema network?

Sorry for the crappy quality vid.
 
My Lowrance has somewhere to select the transducer model installed. Wouldn't doubt if there's something similar on your unit. The 3 in 1 definitely has more going on than the P66 from what I have learned.
 
And since they installed new things I’d verify the power and ground to the display,

I’m also pretty sure under installation there is an auto config mode
 
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