I got mine a little before you did and have 2 of the OEM lamp assemblies from Mitsi. Got them for free too!
The first free one was a month after I bought the set. I wanted a spare in the house and Mitsi couldn't sell one at that time since they were all in warranty. So they just sent me one.
Then about 6 months in the set shot craps and it took them around a month to finally even get a tech to come and fix it. After it was fixed I emailed them and told them I was very displeased with the warranty service. They called and offered to extend the warranty 6 months, I declined that because like you, I have an extended warranty. Told them they could make up for it with a new lamp assy. And so they sent me another one for free.
I'm hoping to get a full 2 years out of the initial lamp assy and I've only got 3 months to go with a lamp that is still going strong.
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