You could write that he was so annoyed by the owner or the children, that he elected to take it to the shop and do the repair there (for a higher fee), in spite of already knowing the simple fix needed for the set.
Mrs. Amato could also possibly degauss the picture tube with the vacuum cleaner running nearby, creating a swirling rainbow mess on the screen as she moved the sweeper back and forth.
Just a couple of ideas, hopefully helpful.
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