Warranty Question

Figure one of you guys will have run into this...
Customer comes in 2 years and several months ago and purchases SRTA through our service department. Vehicle returns last week and, long story short, needs another SRTA--still covered under 3/100,000, but only for another month or so. Fixed it under parts warranty. The question is--does her warranty on the new SRTA run out 3yrs or 100k from the date she purchased the original SRTA, or does the warranty start over for 3/100k on the new SRTA? My thought is that it's like a battery and she's only covered for another couple months since she didn't technically PURCHASE this 2nd SRTA. Personally, I think that's crap, but I'm pretty sure that's right. Anyone know for sure?
Customer comes in 2 years and several months ago and purchases SRTA through our service department. Vehicle returns last week and, long story short, needs another SRTA--still covered under 3/100,000, but only for another month or so. Fixed it under parts warranty. The question is--does her warranty on the new SRTA run out 3yrs or 100k from the date she purchased the original SRTA, or does the warranty start over for 3/100k on the new SRTA? My thought is that it's like a battery and she's only covered for another couple months since she didn't technically PURCHASE this 2nd SRTA. Personally, I think that's crap, but I'm pretty sure that's right. Anyone know for sure?