Check the transistor (?) on the top right of the daughterboard and the one on the main pcb above that (signal+DC).
The parts you have referenced are both the same and are marked "C2NIB" or "C2N1B" - I assume it is the first one but can't be 100% certain. They both measure very strange to me. Between the two pins on the same side of the package they both measure 32 ohms. Measuring across the package from the side with the single contact they measure 77 ohms and 79 ohms. Both of the devices have the same resistance readings within an ohm. I find the readings pretty strange but kind of ruled them out because both measure the same. Unless they both experienced the exact same failure.
EDIT:
OK, if I only use "C2N" for the part I find it could be a CMPT404A PNP transistor. I removed the first one and when out of circuit I can see the base to the collector looks ok(diode), but the base to the emitter is 32 ohms. With it removed I also see some weak 100 MHz signal floating around on the board. So I think there is a pretty good chance we have a winner here. So is the part really a CMPT404A (in stock at Mouser!).
I removed the second one and it measures exactly the same.