7A26 edge distortion


Dear experts,
One of my 7A26's distorts a 1 ns falling edge (PG506, followed by 50 Ohm attenuator) as shown in this photo:


Both channels show the same. I've looked for what I considered obvious problems like the Display Switching area (7A26 SM dwg 4) but haven't found the cause yet. Other 7A26's show the edge fine.
Any ideas?


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