I guess sometimes it's better to just get in there and start looking...
The EGR diaphram was not obstructed, seemed to be moving fine when I tested it. BUT, then I noticed that the hose between the metal EGR tube and the BPT valve was shot...crumbled away when I touched it. Replaced that, but was still getting codes 13 and 32 (eng. temp. sensor and EGR). Took the hose off again, noticed some debris in the small metal pipe that runs from the BPT rubber hose to the EGR. Used some sheilded thermostat wire (it's what I had around) to try and clean it out. Very gummy. Tried to disconnect the metal pipe from the EGR, seems to be siezed in there (not the nut, but the pipe itself)? Really wanted this pipe cleaned out. Poured some alchohol down there to help the wire. Ended up spraying some dw40 into the metal pipe, too. What the hell. Things were cleaning up.
Put it all back together, all codes clear!
Hope this helps someone.