The M20 beam blocker main shaft seals were replaced as per the T1/T2 target device maintenance schedule.  Both air cylinders were found to be leaking past the seals, and the blocker would not actuate in the hot cell even with 100psi (max site air) so they were also replaced.  With the new cylinders the blocker actuated smoothly at about 45psi.  It is recommended that the air cylinders be replaced every second service (once per 10 years).  The blocker was returned to the beam line and smooth actuation and limit switch functionality were confirmed.

The following final checks were performed on T1/T2 devices:

- Lower air amplifier started and tuned to 120psi output
- Air amplifier cycle time measured:  70 seconds for two cylinder turn-overs (1 complete cycle)
- T1 and T2 profile monitor actuation checked:  T1 reached in and out limits but speed unknown because target covered;  T2 traveled smoothly in and out and reached limits as expected
- T1 and T2 target ladders were moved to the various targets that could be used this running period (#1 for T1;  #1, 3, and 4 for T2) - No issues

The T1 and T2 targets are ready for the running period.  Shielding can now be replaced over T2.