It depends on what the plan rules include for leave of absence. You should take a look at the pension plan's summary plan description (SPD) and see what it says about LOA. There may be more specific rules in the plan's formal plan document but the SPD is a good place to start. I am not sure I fully understand the transition that occurred in 2007 but it may be the case that you did not accrue service after that time. It wouldn't hurt to review your situation with a local employee benefits lawyer.
It depends on the terms of the pension plan, so someone will have to read the Summary Plan Description (SPD) or the full plan to know for sure. That said, I cannot imagine any plan awarding service credits for six+ years on a LOA. The most I have ever seen is one year, and that is increasingly rare. Most plans require an employer to contribute toward the employee's pension based on hours worked.
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