  A rip in the MLI at the exit aperture of OMA, the NuSTAR optic aligned with
detector focal plane module FPMA, has resulted in an increased photon flux
through OMA that has manifested itself as a low energy excess. Overall, the MLI
coverage has decreased by 10%, but there is an additional time-varying
component, which occasionally causes the opening to increase by up to 20%. We
address the problem with a calibration update, and in this paper, we describe
the attributes of the problem, the implications it has on data analysis, and
the solution.
