The radiator part, speak with the manager when they give you the bill. You brought it to them working now it’s not.
Parts are always a wait from Triumph, not the dealerships failure, it’s the company. They don’t keep a well managed stock for the R3.
I had mine done under warranty as well, I feel for you, took them about 6 weeks to get all the parts in and work done. If it doesn’t come back flawless go straight back and tell them. Don’t wait or they may try and blame “rider error”.