Arrived on site customer stated stated that their Rinnai tankless is leaking. Upon inspection customer stated that they have a leak coming from the cabinet of the tankless. Removed front cover and found that the heat exchanger is leaking. Told customer in order for us to get everything covered under warranty we will need to contact Rinnai tech support and get all proper part numbers and run through their diagnostics. Gave options for repair vs replacement and at this time customer does not want to move forward with any work. Collected visual diagnostic fee and will credit towards and work quoted today.