I bought it on ebay without warranty...
If you just bought it might ask seller on Ebay if any chance of discount. Slim but worth a shot.
Well the if the chip's are truly effected. Chances of being able to fix it as a individual are slip. I'm sure there are some that are guru's of it and have tools and can do it, but most likely very few can fix.
I do know a seller with a good relationship with LKETC if your interested i can ask if he's able to get module and price. PM me your general location (state/country) so I can get a idea on shipping with it.
But your best bet as far as getting good board is to sell that one on forum there is a selling forum on here, and buy anther board. Depending on how machine is working with that board will depend on what is best. If it's working with some of chips on board you might be best to run with a few chips down, if whole board is not working then replacing it would make sense.
I welcome others opinions here if they see/think of a way to fix board. Please speak up and help poster.
*My standard warning with not seeing board running a board with issues i take no responsibility if problems/damage as I cannot say without seeing what can happen