While on ISCT1 I bumped the beamsplitter that is dumping power on the POP path before it gets to the POP AIR and POPX. It turns out all the screws were loose.

As the diodes are on transmission it doesn't look like it got too misaligned. I just torqued the screws where it currently is but have not realigned onto any of the diodes yet as my CDS laptop keeps crashing.