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

NuSTAR low energy effective area correction due to thermal blanket tear