Take a look at this:
The driverless transport system that connects Terminal 2 at Munich Airport with the satellite building is to be expanded in its functionality to be able to handle the rising passenger volumes without any problems in the future. The planned conversion requires intensive test operations, while the "airport subway" is not available for transporting passengers. The planned tests will be carried out in the period from 30th July 2018 to 6th September 2018, from Monday 12 p.m. to Thursday 12 p.m. During this time, passengers will be transported by shuttle buses to and from the satellite building.As the replacement bus service can extend passengers’ journeys to their departure gate by up to 20 minutes, passengers whose journey begins in Munich and who are departing from the the satellite building - i.e. areas K or L - should take this additional time requirement into account when planning their journey.
https://newsroom.lufthansagroup.com/...f-4862b33ef531