pre-October 13, 1987, indebtedness

(I) any indebtedness which was incurred on or before October 13, 1987, and which was secured by a qualified residence on October 13, 1987, and at all times thereafter before the interest is paid or accrued, or

(II) any indebtedness which is secured by the qualified residence and was incurred after October 13, 1987, to refinance indebtedness described in subclause (I) (or refinanced indebtedness meeting the requirements of this subclause) to the extent (immediately after the refinancing) the principal amount of the indebtedness resulting from the refinancing does not exceed the principal amount of the refinanced indebtedness (immediately before the refinancing).