For instruments prior 2016:
First of all, you should make sure you use good cables such as RapcoHorizon, with a branded plug (Neutrik, Switchcraft).
If you stepped on the guitar cable, the jack input may have been damaged and needs to be replaced. The original reference is Switchcraft  152B but due to manufacturing inconsistency of Switchcraft for this item, we recommend to use an equivalent. Any 'long barrel stereo' jack should work just fine.
For instruments after 2015 that are equipped with the current locking jack unit, reference is Neutrik NJ3FP6C-B