There is no need to guess on the pension. Everything pension wise is listed in the Summary Plan Description. Do yourself a favor and download it yourself from the benefits site. If you are vested for pension, you will get either a pension or lump sum. Your choice. It can not be taken away. NOBODY lost anything they had vesting for. Period.
New entrants to the pension plan ended in 2004. If you started in 2004 and made it through 2009, you would be vested. Those would be the last people in the pension plan. Vesting for pension is 5 years. If you are vested you will NOT LOSE what you are vested for regardless of how you left whether SRD, PRP, fired or just up and quit. The only thing you "lose" is any new future benefits because you are no longer employed by the company.