Note that this board has the following four types:
1) LL type: Arm Length Stabilization (ALS), Laser Locking
2) ALS type: Arm Length Stabilization (ALS), Cavity Locking
3) MC type: Input Mode Cleaner (IMC) Cavity Locking
4) CM type: Interferometer Common Mode
5) SQZ type: Squeezer boards (SHG, OPO, LO and CLF locking)
v7 incorporates the changes from E1800338 (filtering of DAQ channels and boost filter changes for CM)
The PCB has not changed and is still at revision E.