Bankrupt Fund in the Plan

[Santo Gold]

One of the fund choices in a 401k plan is bankrupt. For awhile, the fund continued to report the fund value at a certain value, but then later paid out 75% of this reported value (meaning 75% of this last reported value was liquidated and forwarded to the trustees, not paid paid out of the plan).

This iinvolves a smaller plan. Is there anything that needs reported, via schedule I or otherwise in regard to this transaction? Would the affected participants simply show a 25% loss on this fund to their account balance?

Thanks