Membership maintenance. Three split systems. Performed full system tuneup on all three systems. Checked refrigerant pressures and temperatures. Checked air temperature split at supply and return Plenum. Flushed all drain lines. Tested float switches. All three systems had pure air XVC germicidal systems installed in 2021. These bulbs have not been replaced since the installation. After speaking with the homeowner about the age of these bulbs, she decided to move forward with replacement. Replaced all pure air bulbs and verified everything was working before I left. System #2 had a bad breaker at the air handling unit. Replaced the breaker with the 30 amp square D QO breaker. Restarted system after breaker replacement to ensure everything was working properly. The systems are running well at this time.