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Attached are two pictures. The first is taken from the top of the engine, on the right side. The second is taken from the bottom of the engine also on the right side. Is this the "weep" hole leak on the front of the water pump that indicates a bad water pump? I've lost a gallon of coolant...

I have a 2003 Tahoe and the 4WD would go into neutral every once in a while. Later, it put itself in 4 Lo and took some work to get out. Now all the lights are off completely. Any things to check before taking it to a dealer? It's been suggested it came unplugged in the dash or to check...