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Below are listed those faults for which 2 or more hours were lost.
The telescope control system started to complain about the mirror support system at the end of the afternoon. After some investigations it was found that the fan of the air compressor for the mirror support system had broken up and partly destroyed its plastic housing. As this could not be repaired it was decided to replace the compressor with the spare which took a few hours work, affecting the start of the night. A new spare was purchased.
During the mounting of and instrument the main power switch of the adapter was switched off by accident. This later caused the telescope control system to not be able to start up the telescope and it took some time before it was realized what the `problem' was. A bracket protecting the power button was installed.