once you remove the bad chip.

- determine what might be needed

- You can re-flow the pads with the iron.

- You could clean the pads with Solder Braid, (if needed) then flow new solder...

I just refux the pads, set the chip where its suppose to be, heat it up evenly till it seems all the pads are melted and the solder has re-reflowed to the legs, Then I press down slightly with my dental pick on the chip.

if i need to go over some legs with the iron i will do so.

I would like to say So far, Every-time I thought it was the IC, I was wrong, It was a trace or VIA issue

But I have seen on the web, the SCSI chip on the SE/30 is known for having issues.