You will be charged the cost to repair  (replace if needed) your garbage disposal if the cause of the blockage is due to something FOUND in the disposal  for example  toy, bottle top, metal part (other than if that part if part of the disposal itself), aquarium gravel 

You will NOT be charged, however if none of the above apply and the repair person states any of the following 
 A: Nothing was found inside the disposal 
 B: Disposal was rusted inside
 C: Impellers were frozen 
 D: Metal parts  were found and the vendor either believes them to be from the disposal or is not sure if they were or not