onco - Trigger Event / Point!
My point:
I believe WMI had/has ownership interest in a majority of the securitized trust programs. The trigger point would be the each programs ending. Thus, as each program reaches maturity, vis a via, all certificate holders, (i.e., investors) are respectively paid, then WMI will have access to the residual balances.
These ownership interest would be both a cash collateral and cash investment account provided by WMI and tied to the trusts as credit enhancements.
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