Soarer92

1992 SC300 3 owners, all family members I've had it for about a year and it has a problem where the tranny doesn't want to kick down from 3rd gear. It's only intermittent and i've replaced the whole tranny solenoids and all. Only thing that can be wrong is the wiring or brain. Any suggestions or anyone else experiencing this? It has all the options but traction control (no idea if it was an actual option or not) and heated seats. Also, it has about 165k miles on it and the engine works perfectly. Please help me out with this.