Mexsat 1 was going to be co-located at 113W along with EutelSat 113W A, but I'm sure Lyngsat is wrong about it actually replacing EutelSat 113W A. The Satmex birds, which were sold to EutelSat, are different from the Mexsat birds, which are owned by the Mexican government.
I haven't found much info about Mexsat 1, which apparently only had L and Ku Band transponders. It's sister satellite, Mexsat 3, was launched in December of 2012 and is located at 114.8W (co-located with EutelSat 115W A). Mexsat 3 only has extended band transponders, 3400 to 3700 MHz and 11400 to 11700 MHz, and I was expecting something similar for Mexsat 1.
I do see signals from Mexsat 3, but never any video. On C Band I see signals on the spectrum analyzer, but nothing I can lock on a DVB receiver. On Ku Band there is a data signal that I can lock at 11554 V 30000. Here is the footprint:
http://satstar.net/satellites/mexsat3.html
BTW, EutelSat 115W A is in an inclined orbit after after it's station keeping system failed, but it does have full time video on 12043 V 1522 (a Spanish language news channel) along with some occasional video. A replacement for EutelSat 115W A was launched by Space X in March. Rather than use a rocket engine to get to geostationary orbit from the transfer orbit, it is using a xenon-ion propulsion system, so won't arrive on station until December. Here are the footprints of Eutelsat 115W B, including a rather unusual C Band footprint:
http://www.eutelsat.com/files/contributed/news/media_library/brochures/EUTELSAT_SATELLITE_E115WB.pdf
And finally, Mexsat 2 will be co-located at 116.8 W along with Eutelsat 117W A. It is scheduled to be launched in October on an Atlas 5.
Probably way more than you wanted to know.
