KESE is an interesting case, and there is good reason for it not to be flash cut.
There is a digital 35 application to Mexicali + San Luis Río Colorado that won't be built until 2016/2017 at the earliest. It would have been part of the Grupo Radio Centro national concession package, until GRC realized it just couldn't pony up all the pesos it needed to and waived its rights.
Of course, Yuma viewers can probably receive XHLRT-44 and XHRCS-50 with regularity. XHRCS showed up in the IFT Public Registry of Concessions (sort of like the FCC Query, except it's not) with an authorization to go digital on channel 30 at 10.2 kW. XHLRT-44 has no such authorization, but it is highly likely that they are in digital on channel 22. At this point XHLRT-44 analog is a real hindrance as it screens SLRC viewers from receiving XHMEX-TDT (which is on another network from XHLRT).
K28FM won't ever appear again, as it was superseded by K33MD-D. XHAQ-TDT Mexicali broadcasts on the frequency, and it has a shadow channel (a fancy term for "translator about which we don't know a lot", and in digital, almost always co-channel to its parent station) in SLRC. The FCC lists both XHAQ and XHEXT's shadows in its database (shadows appear as "LD" with the FCC, though there are shadows that operate at ERPs as high as 200 kW!) and says that their ERP is 830 watts.
The listed coordinates for those shadows are not near XHLRT-44 (Av. 16 de Septiembre x Calle 3, 4400 feet from the border!) and XHRCS-50's tower is 100 feet away. (XHRCS is co-located with co-owned XHCRS-FM 88.5.)
If you're wondering, Mexico has made astounding progress on its analog-digital transition and it looks pretty set to go completely digital on the 31st of December. Telemax, the Sonora state network, is going HD within days and has some of its transmitters authorized for digital. Nearly every Televisa and Azteca station is on in digital, though near the border about a couple dozen flip between analog and digital on the same frequency for spectrum conservation (and avoidance of 600 MHz) reasons. Mexicali went all-digital in late March.