1990 Mitsubishi/Ford Eclipse Trans Slipping

My transmission is working fine when cold. After first starting, all gears shift normally for about 5 minutes. Then it starts to slip. After 10 minutes, it won't catch in any gears - forward or reverse. Then if I let it
sit for awhile, it will start catching again.
One mechanic said he heard a whine and said it was a pump failing.
Before we crack it open ($300+ minimum), I wonder if anyone else has had this happened. One thought I had is that residue circulating while running builds up and blocks some passage, causing the pressure failure. I'm not a transmission guy - but wonder if trans can be pressure flushed without removing from the car, on the chance that flushing might cure the problem?
Thanks in advance!!
Bob
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Sounds like it transmission rebuild time. Usually when the oil is colder it will build a little more pressure and not leak past the bad o-rings/seals.

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Right on the money, there Doug. I had a good trans mechanic take it apart and sure enough there was plenty of slick surfaces in there. Also the pump was scored. Found lots of other work there too. Butt a little money now is better than a breakdown later.
For y'alls infermation, the cost of a complete rebuild on this was $1600 at this feller. Probably cheaper places, but not with this feller's 20+ years or experience and honesty.

let
not
problem?
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