(2) the employer is required by
section 1399 of this title to begin making payments of withdrawal liability before the earlier of—
(A) the date on which the corporation finds that the new plan would not suffer substantial financial harm as a result of the transfer, or
(B) the last day of the 180-day period beginning on the date on which the new plan files its appeal,
then the employer shall make such payments into an escrow held by a bank or similar financial institution satisfactory to the old plan. If the transfer is made, the amounts paid into the escrow shall be returned to the employer. If the transfer is not made, the amounts paid into the escrow shall be paid to the old plan and credited against the employer's withdrawal liability.