Check Side Direction Indicator warning but bulbs fine?

[pstarkey]

Bit of an odd one, I am getting the 'Check Side Direction Indicator' warning on the dash with the associated fast flashing of the green turn direction indicator, which is usually a blown bulb.  However all 3 indicators on the left side are working fine and flashing at normal speed.  Other side is fine as are the hazard warning lights.

 

Any ideas what could be triggering the warning even though all bulbs etc are fine and indicating normally?  Bulb on the way out causing car to think its blow, flasher unit??

[Mavrik]

Could be an intermittent earth fault triggering the Canbus system?

 

I would remove the indicated bulb and use contact cleaner on the bulb & receiver 🤔