I start from the premise there is one fault to explain all the symptoms, it is unusual for there to be two independent faults (unless perhaps the pass-through fault has been there for a long time).
Why do satellite TV circles use "transponder" at all? They're not transponders from the user's point of view (or even a technical point of view) - I take "transponder" as meaning a device which responds to a received command by transmitting a response which is not the same as the stimulus. Something which simply passes on what it receives is a repeater.
I disagree. A satellite transponder does a frequency and polarisation change on what it receives, amplifies and re-transmits. This is not a repeater. The response is different to the stimulus, although the information content is identical.
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