I checked the pickoff mirror, IO_MCR_M14, that I installed on the MCR path on IOT2L (see alog 27725), which picks off the p-pol beam and sends it to a beam dump.  I found that with a locked IMC, the edge of the p-pol beam was getting past the pickoff mirror, so I adjusted the mirror position about 1mm toward the main beam.  By IR card, there's about 3mm between the p-pol beam and the main s-pol beam where the pickoff is installed, so enough clearance that the pickoff mirror should not clip the main beam.