Open Procedure, Pursuant To Art. 155, Paragraph 1 And Art. 71 Of Legislative Decree No. 36/2023 And Subsequent Amendments, Aimed At Stipulating A Framework Agreement With A Single Economic Operator Pursuant To Art. 154 Of Legislative Decree No. 36/2023 And Subsequent Amendments, For The Awarding Of The Mechatronic Maintenance Service Of The 2026 Edition Arst Diesel Buses, For Each Of The Following 26 Lots.