Recently, TV picture troubles caused us to summon a repair technician to our home. The technician (we’ll call him Tech No. 1) snapped on his tool belt and started disassembling components as soon as he arrived. He checked over the satellite dish, then he continued the assault on the house by removing rows of ceiling tile for an in-depth inspection. After hand-checking all the connections, an hour into his service call, he condemned the satellite receiver. A couple days later the suspect receiver was replaced, but the intermittent screen-digitization problem remained.