Left rear turn indicator and break light do not work. Bulbs good.

Try moving the bulb around in the socket with the turn signal on to try to get it to work. Otherwise go underneath and find the plugin in the wiring harness and try unplug, & plugging it back together. If it still not coming on, it may be the bulb socket itself, but at that point I would get a test light to see where the power stops, checking the bulb sockets to see if power is there, and working your way back to see where the power stops.