Antares

Hi guys well managed to solve my lack of gears on my 94 wrx auto seemed a rather large dent in the sump pan caused loss of fluid however it won't give me fourth I can get first second third but it will not change up
I've tried error codes and nothing tested the solenoids and nothing I'm looking at the temperature sensor now but I can't find any information about then let alone buy a new one,
it hasn't lost any fluid it's had brand new filter and fluid,
these autoboxes are like some sort black magic lol
any help would be gratefully received