If he scans it with a trans capable scanner he can see either codes leading
to the problem or he can command the tcc on and see slippage in the
convertor right on the scanner, he can also check for slippage in the other
gears, that coupled with a pressure test of the pump will give you a much
more accurate analysis of what needs to be done. If the fluid is burnt at
this point an overhaul may be in order anyway.
If this slipping is trans related then a trans capable scanner can detect a
related code and even command the tcc on to check for any slippage in any
gear for that matter. This and a pressure test will determine the extent of
the repairs necessary.
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