After maintence day this morning, the corner beckhoff was not restored.  The ALS SHG was not working because the temperature was not controlled.  Before we realized this we went to the table to investigate and tried to adjust the beat note alingment.  Once the SHG was back on, the beat note stregth was low.  Although this sounds impossible, the thing that seemed to fix the problem was unplugging the RF amplifier and plugging it back in.