After what year did the Canadarm become paired with the Orbiter Boom Sensor System?
Canadarm:  After the Space Shuttle "Columbia" disaster, the Canadarm was always paired with the Orbiter Boom Sensor System (OBSS), which was used to inspect the exterior of the Shuttle for damage to the thermal protection system. Space Shuttle Columbia disaster: On February 1, 2003, the Space Shuttle "Columbia" disintegrated upon reentering Earth's atmosphere, killing all seven crew members.
February 1, 2003