6 bta air heater question

Have just recently repowered with 6bta’s. My port engine starts and runs well, with very little smoke after initial startup. The starboard engine is hard starting, needing me to cycle the air grid heater on and off for two to three cycles before it will start. I know it is working as I see the voltage drop and can hear the clicking sound of what I would guess to be the relay. Once started it smokes excessively with white smoke. After the motor has been run under a load and it warms up, the smoke does mostly disappears. I know that while warming up and while trolling, the port side grid heater occasionally cycles on. The starboard heater will not cycle on/off at all after the initial startup. are there two separate circuits, one for startup and the other for once the engine is running? I have swapped the sensor units but that made no difference. I was just going to order a new air heater assembly but thought I might first ask here if there are any relatively easy things I might check for. I see there are two relays in this assembly. Is it possible I have a defective relay or do these symptoms point to a defective ECM? Engine serial number is 46398122. CPL 8457.

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Grimmrs149