We examine the effects of random magmetic field errors on the performance of a free electron laser. We report a modification of the straightest wiggler orbit operating point (SWOOP) theory for two very high efficiency systems. The first system utilizes a gapless pulsed cryogenic wiggler and the second a continuous wave gapless superconduction wiggler. We further show a method to improve the choice of separation of correctors. To establish this method we show that corrected steering errors, BPM errors and gap misadjustments are errors similarly construed as phase errors (ESCAPE). The corrected steering errors also have a component that requires retuning of the wiggler and this task is relegated to unoptimized SWOOP. Without this retuning, these errors are emittance cannot be removed by returning except for the resonant particle. The remaining part of the field errors are similar to similar to an effective emittance, but because the steering errors are homogeneous and the emittance is inhomogeneous, the phase errors and behave like a random force in the KMR potential. In a returned wiggler, the effective energy broadening from emittance is responsible for the initial trapping and the field errors are responsible for the detrapping. This work constitutes a complete high-efficiency model of phase, gap and corrected steering errors for an enmsemble of the free electron lasers. The classical bound-free transition, the detrapping phenomenon, is treated as the Kramers problem.