The noises heard on the outdoor heat pump by the homeowner were unable to be duplicated or replicated while on site today. The system was ramped up and down multiple times from off to maximum cool and several stages in between. Refrigerant pressures were tested perfect at 117 and 325 with 9sc and 17 superheat. Air filter is approximately 2 to 3 months old on schedule with homeowner and he will check and replace. Diking control does not indicate any service codes or caution indicators Recommend homeowner use system normally until the noise can be positively identified by a daikin service technician