I will sorting out my fridge soon and will add a heater and some way to get the temperature probes into the fridge too - both tasks may involve some drilling IMO. There might also be some other tasks I haven't considered (like bolstering the shelves etc.) that may also require some drilling too..
So my question: Are there any issues with drilling a ferm fridge? - I know I could break something

Any advice on this would be appreciated before I end up doing something stupid that can't be easily reversed...
Cheers
Carl