There were no faults causing more than 2 hours downtime during period 39, but there was one problem that caused small amounts of down time on various occasions. Although also in total it did not cause 2 hours downtime, it was the single problem that cause the most downtime in the semester so I will discuss it here.
On several occasion there were reports of unexplained building `jumps' and crashes, where the latter caused in several cases downtime of 10-30 min as the telescope system had to be restarted. Some investigation showed occasional increases in friction in the building drive system. It was suspected that one of the building brakes (which are activated when no voltage is applied) was failing, and after replacing one of the power supply units the fault has not recurred.