There was due to be a meeting of the Bus Services sub-Committee tomorrow, but that isn't appearing on the calendar now. The agenda for the main committee meeting next week is now published, and Appendix 1 includes a list of bus services at risk in October, and what will happen to them (pages 10-13 of the PDF):
(It's been pasted in as an image, rather than a plain table, so I can't copy it out easily and don't have time to retype from scratch)
Of those services I can see listed above, 237 is being tendered, final awarded option "subject to DCC" (I presume Derbyshire County Council, as there would be an expectation that they pay a portion), likewise 358. 322 is "direct award" (presumably a 'De Minimis type funding', whereby it's awarded direct to the/an operator pending further changes in October), 313, 328, 378/379 are all listed as "Tender".
Note that TfGM intend to tender or Direct Award everything other than some peak hour special withdrawals and some frequency reductions.
Is there an Arriva route that isn't on that list as due a frequency reduction? I'm a bit rusty as to what they are left with now.