The 1N4742A is a 12V Zener diode. but if you measured it at 0.74 (assuming it was at 0.5mA) you can try and find the closest equivalent on this link here.
It is worth notting that as @Feral Feline mentionned, any regular silicon 1N4148 or 1N914 is a perfect replacement, would'nt hear a...