If your brother changes the fluid, I'd suggest putting a bottle of tranny fluid treatment in, letting it run up to temp a couple times, and then changing the fluid. That way the fluid treatment can clean out the gunk from the valve body and soldnoids and you wind up with clean fluid in the pan.
In addition, I found what looks like a decent Celica forum, might want to pose the question here:
http://www.toyotacelicas.com/forums/...th-generation/
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