Maintenance days always fall on Mondays of odd-numbered weeks, unless they are holidays or public holidays. In this case, the maintenance work is carried out on the first working day after non-working days and holidays.
January 13, 27
February 10, 24
March 10, 24
April 7, 8, 9, 10, 11, 12, 13, 14, 15, 16
May 5, 19
June 2, 16, 30
July 14, 28
August 11, 25
September 8, 22
October 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17
November 3, 17
December 1, 15. 29.