I have a Lowrance Elite 5. The depth reading is stuck on 1.4 to 1.5 fow. I did a hard reset with the zoom in, zoom out and power buttons. No luck. The unit was working as my secondary when I took it off my Thompson. After installing on my Blue Fin I get the stuck reading. Same transducer, same cabling. Cables look OK but there is a little corrosion in the plug of the cable. I sprayed that with a shot of penetrating oil. Transducer, cable or something else? Any thoughts appreciated.