Is anyone able to clarify exactly what is covered by the monthly Wiring Maintenance Fee that Spark offers?

I always thought that it was solely to do with any house wiring, including jackpoints.  I had planned to drop this with my move to UFB, as I'll have my phone plugged directly into the ONT, and won't be using any copper.  However, on talking to a Spark rep today, they mentioned that it was for any wiring 'past the gate', and indicated that if anything was to fault with the fibre from the roadside to the ETP/ONT, I may be up for a repair bill.

Their page reinforces my thoughts that it is for house wiring - http://www.spark.co.nz/myspark/mylandline/wiringmaintenance/.  While my ONT backs onto my ETP, what is the status of the fibre run between the ETP and ONT?  Is it covered by wiring maintenance, covered by Chorus (as it is all their gear?), or something else?