When the strobe burns out it frequently shorts out the transformer and neither strobe will work. Here are the part numbers and pitfalls in repairing the strobe. The position light bulb is PN: W1290
W1284 [R] or [G] for red or green. The lense is very fragile.
When reinstalling the canopy you can look at the inspection port and tell if the control rod is far enough back to enenge the locking pins.