How do I find out when each error occurred?

Ιf I do not press any button while reading an error for 3 sec, then i can see the day and time it occurred.

How do I enter the error menu?

By pressing the enter button we enter the error menu. We see the most recent error.    In order to see older errors we should press the down arrow.

How can I move the elevator car in maintenance mode from the control panel?

First, I turn in maintenance mode and then I press the upper or down arrow

How do I enable and disable maintenance on a sk3 board?

In order to enable maintenance, we press once the revision button on the board's screen. Before this, the screen should show the floor.

To return to normal mode, we press for 5 sec the same button until the led which is above it is turned off.