JW wrote:
Let's say you know that a certain point on a data bus has a defective
device that is always trying to drive the bus low; Was wondering if anyone
has any good tricks in finding the defective device, other than
cutting/lifting pins?

Drive the bus high, e.g. with a 1k resistor to Vdd, and use
millivoltmeter. You can see the voltage drops in the traces--where the
voltage drop is changing, current is flowing.

Cheers

Phil Hobbs