I purchased and built a mk127 running microbug. After building it I was surprised to find that nothing happened when I turned on the kit. After debugging the problem I found that 2 of the transistors where swapped. I went to take them off and managed to break both of them. What I am wondering now is if I can swap the broken parts with parts that I have (the bc547c with a 2n3904 and the bc557c with a s9012)?