A good example of why it's always a good idea to keep a physical note of all important menu settings.
I think RF UHF channel 63 is the default for that decoder as well. There is no "correct" setting, you need to make your individual adjustment if and as needed, which could have been done in the initial setup.
In the bedroom(s), try and see what RF UHF channel was being used and then set the HD PVR to that.
If too late to determine due to adjustment attempts to fix, set the HD PVR to the lowest UHF channel (should be 21 or 23) and see the results on the re-tuned TVs. If there's any interference then progressively try higher UHF channels.
EDIT: If you meant that the TV was always on ch. 63, then just adjust the HD PVR back to that (but note that the quality may improve on the lower ch.s if you want to try that).
Also make sure that both the decoder and the TVs are set to using the "PAL I" standard.
I'm presuming that the Remote blaster is still working, and that you don't make use of the Explora's RF output or have it connected to anything.
Last edited by Optimist; 2017-02-19 at 17:25.