During first injection of beam down 1A problems were encountered with the T1 protect monitor.  Testing was done by Probes Group from the mezzanine leading to the following investigation and repair work.

May 9th:

- T1 area uncovered, Probes Group performed testing at the top of the monolith confirming that the problem was below the vacuum flange
- T1-MK2 target moved from the beamline to the hot cell.  Measured field 800uSv/hr at ~0.5m
- Visual inspection of protect monitor performed:  No obvious issues with monitor plates.  Some small impact holes visible on exit side of monitor, similar to damage on the previous monitor from Oct 2015
- Electrical check performed on old protect monitor in hot cell, confirming the previous results
- Failed protect monitor removed, resistor pack installed and tested with expected results
- Profile monitor insulation found to be blackened and cracking, so the profile monitor cassette was also removed
- New protect monitor and profile monitors installed
- Electrical check performed on both monitors at the hot cell: Results good for both

May 10th:

- Vertical and horizontal positions measured for the new protect and profile monitors
- Profile monitor actuation tested:  started moving ~10psi, fully actuated ~50psi, monitor limit switches ok
- Measured total resistance of potentiometer: 20.26kOhms
- Target windows inspected and photos taken (stored on Isaac's hard drive), nothing unusual encountered
- T1-MK2 target returned to beamline, vacuum pumped down without issue
- T1 cooling package started fine with no change in vacuum
- T1 profile monitor actuated in and out.  Movement smooth and slow
- Electrical check done on protect and profile monitors from mezzanine: both good