[Elecraft] Help! Rescue me from stupid error!

[Vic, K2VCO]

I just did one of the dumbest things I've done since I tried to swim 
across the Susquehanna river with all my clothes on. I survived that, 
but I need help with something else.

I just turned on a computer plugged into 230v with the switch on the 
power supply set to 115v. Result: bang, smoke, house breaker (16a) pops.

I took the power supply apart (it is a funny size so I have little 
confidence I could replace it). I found two obviously bad components: 1) 
an 8a fuse -- no problem. 2) something marked znr1 on the board, a 
component wrapped in heatshrink tubing. It was completely destroyed. 
Next to it is a similar part labeled znr2. I haven't removed it yet -- 
so I am not sure it is good. It might be the same as the first one and 
it might be marked under the heatshrink.

There is a bridge rectifier nearby which checks good. All traces look 
ok. I am hoping there is someone out there who is familiar with these 
supplies who can suggest what these are (zener diodes? What voltage?)
The board is made in such a way that it is difficult to trace the wiring 
-- but these parts are right near the power input.

-- 
Vic, K2VCO/4X6GP
Rehovot, Israel
http://www.qsl.net/k2vco/