There is a good chance i can find you one in my possession.
Some 10 years ago i had problems with my VX-1. I bought a new ducer. Turned out to not be the issue. Called Marcum for a fix, told them i tried a new ducer. They repaired for free out of warranty since i had gone an bought a useless transducer.
Original one never went bad.
I think i know which box to look in to find it.
Long story short.
Let me know if you want me to look. Send via PM.
If it isn’t working right, i’d first check your electrical connections and make sure the little spades and the wires connected to them are still good. Lots of times strands of wires can break and you’re down to 1 or 2 strands holding it all together running power. It acts like a weak ducer, etc…
Again, PM and i’ll set you up for a good price, or you can try it. Whatever. Pretty sure i can find it.