It is worth noting that Ontario TGs are frequently, but not always, heard on Monroe sites. Less frequently, a Monroe TG, usually EMS, may be heard on Ontario North.
It all depends on if there is a unit affiliated on that TG in the area. Even Geneva PD occasionally shows up on Monroe East for an hour or so. I assume a unit is in Rochester for court or a prisoner transport.
So, nothing is wrong with your radio if you live in Rochester and wonder why you only hear Ontario Law or Fire dispatch TGs intermittently.
Also, while the Monroe Fire and EMS TGs are nominally P2 TDMA, most dispatch and VHF patch TG activity defaults to P1 FDMA and can be heard on a non-P2 capable scanner. The EMS-Tac TGs are generally P2 since all units are P2 capable.
The RRDB Note: "Some talkgroups on this system are using Project 25 Phase II TDMA modulation which can ONLY be monitored using a P25 Phase II compatible scanner." applies but with emphasis on the word "Some". Some transmissions, on Fire & EMS TGs, may not be heard some of the time if your scanner can not receive P2.
When (or maybe if) Monroe Fire and Law ever move primary communications to the TRS will be when a Phase II capable scanner will be a necessity in Monroe County unless you only want to listen to Public Works TGs.
AFIK, there are no present plans for the Ontario sites to switch to P2 at any time in the near future.