2000 Eldorado ETC dash lights flashing
 

A friend of mine volunteered to put in a new CV Axle , it was too long , right part # he pounded on it with a block of wood , finally we took it back and got another which fit no problem ! But now my shifting lights on the counsel do not work , the ones on the dash are flashing , the service engine light is on and also the battery light , but everything is working fine any ideas what he might have upset ?
Love this car , 2000 Eldorado ETC