First, clear any receive tone. Leaving the receive tone empty will allow you to hear everything on the frequency. I always start there.
Then, once you can hear everything, try transmitting and listen for any kind of sound, such as a response or squelch tail.
If you don’t hear anything when you try, try getting closer to the repeater and listen on the uplink frequency. Scan for tones if possible.
Yes, it’s entirely possible for the tones listed here to be wrong if the owner didn’t change the information.