After checking the compressor and finding it running at a normal temp I did some online research. Realizing there was no airflow in the fridge I unloaded the freezer and pulled the back panel to find the fan running but the coils all froze up. After testing the temp sensor and finding it closed I defrosted everything with a heatgun and then checked the 2 heaters finding 1 bad. Another google and I found a complete kit with both heaters, wiring and the sensor at AppliancePartsPros. It arrived in about a week and took 15 minutes to install.
Since I had restarted the unit while waiting for the kit to arrive it had maintained temp but started icing up again. After installation I reopened the back panel to check 3 days later and the ice buildup was all gone and it has been working perfectly for over a month.