I'm trying to find the components of the PCB I have. But I have a problem with a 5 pin (I guess SOT23-5) component. Can someone help me abuot this? There are version1, version2 and version3 of the PCB and marking codes are AA43, AA44 and AACB respectively.

There are reset button and error switch on the board. I measured the voltage values when I pressed any of them (see Schematic).

http://imgur.com/XriL4ph

(PCB)

http://imgur.com/Vb7wPAT

(schematic)

 

This might be of use as a site
https://www.hotenda.com/marking-code/search/index.html