Smart UPS 2200 Fault Multiple LEDs flashing on power up. Need scematic to find out what Diode D13 is

[Anonymous user]

Photos attached. 
Image 80 is the full Internals
Image 89 is the rough area of D13
Image 86 and 85 are the Board Model number on the PCB
Image 83 is the Outer case information with the model number mine is the 2200
Image 87 is D13 in close up with the A4 in view
Image 82 is the close up from a different angle not as clear.

Hi New to the forum hoping someone can Help.

While testing the Relays RY0-RY3 I supplied 24VDC the wrong way around and magic smoke came out of the diode D13. I need to know what diode this is to be able to replace it.

I have checked the Relays and all are working could do with a schematic for this board as the schematics I have found so far for the SM UPS2200 are for the upright one that has a 1N4148 as D13 which is a 2 pin signal diode. 

Can anyone have a look inside there rack mount one and find the marking on the component for me please. It seems to start with A4

[Anonymous user]

Ahhh I put it in the wrong section.....

[Anonymous user · Accepted solution]

Anyone got an idea I just need the part number of someone's working ups.