I'm afraid he's probably going to have to find them himself. I found the other 3 repeaters by doing a Limit Search while driving up Highway 11. I would suggest he do the same.
I would also keep the other 3 repeaters in ID Search mode. It's possible that they might be using the Burks Falls repeater with a different Group ID.
I did look up their licences on TAFL and found nothing changed since 2011. TAFL shows the following as frequencies:
152.420, 153.020, 153.725, 153.830, 154.100, 155.130, 155.655, 155.725, 165.630, 167.280 and 169.410.
152.420/155.655 is the repeater pair already in the database. I would suggest removing the pl tone to see if any DMR bursts are heard.
The other departments that switched over seemed to have just converted their old frequencies to DMR.