The converter will need to be cut open and cleaned , also checked for any damage inside, check hub, ect.
Reverse pattern valve bodys are usaully built for max effort shifts, so yes the accumilators are often deleted.
There are a couple of folks here that will post up some links for your parts chasing .
It may be a broken 2nd gear sprag race and related parts to that sprag. that is just a guess at this point till the unit is torn down
Yesterday is history.