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The manual shows 5 flashers and general illumination each of which is controlled by its own driver transistor, so i don’t see how all the flashers could stop working at once, unless some board components went bad.
The flasher bulbs are a #63 and should be tested or replaced.
The flasher bulbs are powered by the solenoid driver board transistors that normally would power up solenoids at a higher voltage that the flasher bulb would allow, so some flasher bulb sockets might be mounted to a board with resistors to decrease the voltage that the flasher bulbs require.