I/W Upon arrival inspected Burnham Alpine boiler. Here to check unusual noise/smell from boiler. Ran and tested boiler operation, did not hear any unusual noise from boiler @ this time. Checked all gas joint with gas leak detector. No leak and or smell from boiler. Check exhaust pipe for blockage. Ran and tested all zone operations. Cycle boiler on/off boiler is running. On initial start boiler will sound louder than running operation but noise will subside after boiler fires. Pressure is normal all zones are operational. Recommend that customer record when boiler is making noise. May need to follow up with combustion test on boiler Called customer to review via phone. Customer was unavailable.