A little help please

I am new to the forum. This is my first posting. I dabble a bit in audio equipment, ( buying & selling ) mostly ebay and craigslist. However I recently attended a estate sale and purchased a piece of equipment, that I think requires more knowledge than I have. ( Nakamichi 1000zxl Limited gold face)
I bet that will make some ears stand up. The unit is cosmetically fantastic, sonically the left channel does not play. After research, I found, repairing the unit will cost between, $1500 & $2000. I am going to sell it, however repairing it is questionable for me, profit wise. Plus some buyers may want their own tech to do the repairs. After extinsive research, I have found, there was between 100 & 200 made worldwide. They were made to order and sold in 1981 for $6000.00. Ok here is the question. Value?
As I stated it is for sale. Being such a high end and rare unit, I feel it should command a fare price.

Thanks to everyone who responds