Situation
Solution
Fan speed too high of one fan of the LDM
Malfunctioning fan. Replacement needed. Remove the fan from the LDM and replace the fan. See service procedure "Removing a fan from an LDM".
If problem persist replace the LDM. See service procedure "Replacing the Cooling Unit control boards".
Fan speed error on both fans of the LDM. Malfunction LDM.
Replace the LDM. See service procedure "Laser Driver Module".