My brake light and ABS light recently started coming on itermittently. on 2005 GMC Safari

I understand this is related to the EBCM. Dealer tells me in excess of $1300 to replace. Read other blogs about some potential fixes. Trying to gather as much DIY info I can before shelling out the big bucks only to find it was some simple fix. Any and all suggestions appreciated. Thanks..Lee

Asked by for the 2005 GMC Safari