Received a call that the boiler was making a loud noise and that it gotten turned off. Upon arrival cycled it on and found that the main circulator pump was making a lot of noise from the bearing assembly. I confirmed that it was the bearing and optimotor, I lubricated all three ports and allowed the oil to sit. Recycled it several times and the pump is no longer making noise. We are going to monitor the pump going forward to see if it still needs to be replaced or if the bearing was salvaged by lubrication.