There theoretically is a way to use the 92 for this:
Program in the freqs in LTR mode, but DO NOT label them with alpha tags.... Watch as the TG's pop up for what freq is active. You can at the very least get the Home Repeaters down this way... Then you can do the ONE freq at a time method just like with a Uniden to decipher the rest....
It will take a lil time and effort to do this....
Or you can tap the discriminator, build a data slicer, run it all to your PC and run LTRDump/LTRTrunk on it. Iether way its not a simple process to do... but thats half the fun of figuring out trunked systems...
At least with LTR you can get LCN's with only one scanner, where as EDACS systems require two or more scanners to properly nail down LCN's.