904 no 3rd gear?Why?

I have this 904 that I took to the tranny shop to be looked over.My buddy says..looks like a re-build alls good,I say O.K put a stage 2 shift kit and order a 2500 stall.I get the tranny back,and am trying to set the kickdown,no luck with it shifting to 3rd.So I take the car there,and apparently it,s not shifting to 3rd.It shifts good 1st to 2nd,no 3rd?Also no problem with reverse.He said something about cervo?Anyway they have the car and am hoping to have it back for the weekend?Any ideas why I,m not getting 3rd?Thanks.