Tom M. 12-18-24 customer stated the outdoor unit was making a loud noise last night. On arrival system appeared to operating normally. Signed customer up on maintenance plan and completed the first visit. Tightened all electrical connections. Compressor amps 13.5, Fan amps 1.0 Compressor megohms are good at 1000. Capacitor 44.8/4.9. Forced defrost. Refrigerant charge looks good. All heat strips are operating pulling 21 amps. Blower motor bearings are good. Customer was outside when I forced defrost and stated that was the noise he heard. No unusual noises are happening now. I recommended customer takes a video if it happens again.