Forgot to update this thread.
Basically, the repair company showed up, very professional and prompt. Tech seemed to be very knowledged in TVs and answered all my questions.
He told me basically, the reason why my TV wouldn't take the 13.06 update was due to the memory being full. I told him about the flashing green LED I received a month or so ago, and he ordered me up a mainboard.
2 days before they called me to install the mainboard, I received the flashing green LED again, coincidence right?
Tech came, I showed him the flashing green LED thing, he replaced the mainboard, TV turned on normally, running 13.06 firmware.
So all in all I'm happy, since the TV is under warranty. I'd really hate for this thing to crap out with the mainboard after the warranty expires.