  The MMT Adaptive Optics exoPlanet Characterization System (MAPS) is a
comprehensive update to the first generation MMT adaptive optics system
(MMTAO), designed to produce a facility class suite of instruments whose
purpose is to image nearby exoplanets. The system's adaptive secondary mirror
(ASM), although comprised in part of legacy components from the MMTAO ASM,
represents a major leap forward in engineering, structure and function. The
subject of this paper is the design, operation, achievements and technical
issues of the MAPS adaptive secondary mirror. We discuss laboratory preparation
for on-sky engineering runs, the results of those runs and the issues we
discovered, what we learned about those issues in a follow-up period of
laboratory work, and the steps we are taking to mitigate them.
