Here are scanned transponders which might be 172E:
11499 V 22499
12229 V 22499
12600 H 34999
12645 H 21369
I only have good SQ on 12600 H the others are too low to scan a channel even if was there.
Oddly, 11499 V seems like it may be a transponder on 169E so not entirely sure what I'm...