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1990 Porsche 928 Questions

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I have 1989 Porshe 928 s4. Recently when the car is turn off all instrument lights will turn off, but there is a low glow of light in the instrument dash quite visible in the dark. If left for a day or two it will completely drain the battery. Anyone have an answere!
The differential starts to act up after some normal driving. I get grinding noises especially when turning at low speeds. Have tried changing the fluid including using additives etc... it seems like there is damage in there. Has anyone experienced this and know what it might be? Is it worth rebuilding and is there someone local that specializes.
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