Well, I was unable to remove the short by reflowing the pad or using solder wick. So I attempted to break the connection by carving out the conductive material with an x-acto knife on the chip itself in the vertical half circle that runs down the edge of the chip. This was successful, so I cut the 1cm etch that runs to a via and put a wire from the via to the top of the chip where the silver conductive material goes under the top cap of the chip. This is where things went wrong. That silver material did not like being soldered - it sort of just disappeared.
In hindsight, I should have used the x-acto knife to cut away the connection where the half circle solder point meets the PCB itself, then run the wire from the half circle to the via. Live and learn.
So the chip will need to be replaced again with another donor chip.
During all this screwing around, I also noticed the Teledyne RF relay was cooked. Measuring resistance at the BNC in 50Ohm mode at some vertical amplitude settings, the impedance was 285 Ohms. So it looks like someone overloaded the input when the scope was in 50 Ohm mode. That's replaced and all is well there now.