The DESY MKK shift crew is responsible for magnet power supplies, HV supplies for RF transmitters, watercooling and air conditioning systems, the HV and LV mains of entire DESY. To keep track of the failures of these systems an electronic logbook was developed. The content of the logbook is available to the maintenance groups giving them the possibility to comment on failures to help in future troubleshooting. Via different filters andsearch functions it is possible to select failure types, detect multiple tripped components and get a good statistic of trips to see whether systematic failures occur. Hence an early detection is possible and preventive maintenance on these components can be done. The logbook was developed using ORCALE RDBMS (Relational Database Management System), and uses other databases to get information about the built incomponents as e.g. magnet power supplies. It is in use for more than one year with a large acceptance of the shift members
