It sounds like this is another case of "you snooze you lose" as they no longer have pre-paid maintenance on the menu anymore. Maybe it's still available as off-menu if you are still fast enough!
They used to offer 8-year pre-paid plan then down to 4-year then now zero-year!
The prices of Extended Service Agreement (extended warranty) are still available at:
Extended Service Agreement
Its terms and conditions are at:
https://www.tesla.com/sites/default/files/service/vehicle_extended_service_agreement_en_us.pdf
Owners do report that they have to pay $200 deductible each visit as indicated in the document.
However, I had the following extended warranty visits (all after 50,000 to under 100,000 miles) for no additional cost, no deductibles for my 2012 Model S that I now traded in this year:
>$500 Gen1 Mobile Connector
$4,000 for re-manufactured MCU (17" screen and computer)
$4,500 for cabin heater
Another case of "you snooze you lose" for my 2012 Model S as I paid the Extended Warranty for $2,4000 and I didn't listen to owners who were very vocal at that time that it's a rip off, the house always wins...
That $2,400 went up to $4,250 if I listened to them!