Transmission won't downshift on 1993 Toyota Camry

My Camry with 379,000 miles started go into third gear rather roughly, then the car started to not downshift to first gear when coming to a complete stop. All the gears work without any delay. When driving the car in D with PWR mode on (revs hit 4,000 RPM), the shifts are smooth, but when driving slow, all gears will go in (4th will go in at <15 MPH...really annoying). I have no idea what could be the problem. Oh, and the tranny also started to leak between the trans and the engine. I don't want to spend $1,500 on a trans rebuild on a car with close to 400,000, but it is a solid car, I don't want to get rid of it. Any ideas?

Asked by for the 1993 Toyota Camry
the repair will most likely exceed the value of the a free diag and est from aamco then shop prices
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1 more answer
When is the last time it's had a simple filter and fluid change (not flush)? That may help with the symptoms a little. You also state that it's not downshifting on it's own. Will it downshift manually?