1st Gen Makerbot Dual Thermostat issues

Hi All,
I am having an issue with my Generation 1 Replicator Dual thermostat on my Left extruder assembly. I recently bought a new extruder assembly and just got it wired onto my Makerbot. The right extruder works fine, but the left extruder is stuck at 60C. When I try unhooking the right extruder thermostat, I get an error reading that the unit is no longer receiving a signal from this sensor. However, when I unhook the the left extruder thermostat I do not get this error, so it appears that the unit still thinks that it is getting a reading from this sensor. Furthermore, I have confirmed that the left extruder is heating up and I have used a infrared thermometer to confirm that it is reaching a temperature over 60c.
I am running firmware 7.5, and everything else appears to be up to date.
Does anyone have any experience with this or a similar issue and can possible recommend some troubleshooting solutions? Please let me know if you need any other information.
Thanks!