I have had several older Sonicwall TZ-180's were the wrench or amber error light comes on/blinks or the Sonicwall suddenly has strange errors. Since these were out of warranty I figured I would open them up. Here is what I found.
www.badcaps.net. The voltage does not matter as long as it is the same or higher than the old ones. Do not use Capacitors from Radio Shack.
The capacitors cost .67 ea. The repair took 15 minutes. You will need a decent soldering station and a lighted magnifying glass to do the job. See cap removal page on badcaps site on how to replace them. Replace both caps even if one is not swollen. The third green and copper cap can stay if it is not swollen.
I recommend doing a boot to firmware with factory defaults from the settings section. This will clear the memory of any corruption due to the bad caps. You may have to do a boot to safe mode the first time if the Sonicwall was not accessible before the repair. Unplug power hold the reset button down plug in power and continue to hold the button for 30 seconds (no less). Then manually configure your IP to 192.168.168.xxx where xxx is any number except 168. You can then access the Sonicwall on 192.168.168.168. Then do the factory reset.