OK, you know what level I'm stuck on. You have to get into Security to release the X so you can take the reconstructor plasma thingee Y and stick it in Z, etc. I made it this far. Granted, that's not exactly hard. But hey; I'm stuck. All the jail cells w/zombies locked inside require a PDA to open. I have searched EVERYWHERE on this level. I crawled under EVERY desk, into EVERY crawlspace, looking for PDAs to update my security code so I could get into those cells. Where the heck do I go from here?