The ozone lamp will die after many years of service
but along the way, it will begin to decrease its ozone (O3) production and you WILL experience Ozone Starvation (see other FAQ)
The ozone lamp power supply might live long enough to power two or three lamps
The Darlington Pair power transistor that controls current to the sensor chip’s Peltier cooler will fail
sometimes the Peltier chip pulls too much current;
sometimes a technician will unplug and re-plug the Darlington cable and blow the transistor (I’ve done this at least once)
When reassembling technicians can cause stress on the ACU02 (the CPU board that sits on top of the BPR (backpressure regulator) by not routing the ribbon cables neatly; this will break solder connections on some very sensitive chips.