Customer reported grinding noise from outdoor unit. Thinks it may be when reversing valve switches back and forth. Tech inspected system, recorded amp draws and refrigerant pressures in each mode, and tested defrost. Found no challenges with defrost or reversing valve. Couldn’t duplicate grinding noise. Tech heard no unusual noises from system. Tech found 7.5uf blower capacitor reading very weak at 4.35uf. Blower motor is warm to the touch. Tech found 5uf fan capacitor reading low at 3.9uf. System pressures are a bit low indicating system slightly low on R410a refrigerant. Reports system has been cooling fine this summer. Tech found one leak hit on bottom left corner of indoor coil. Could not duplicate again after leak searching several minutes. Tech recommends replacing both weak capacitors and getting system on preventative maintenance. Quoted prices for capacitors and leak search. Customer declined leak search for now. Approved PSA, capacitors, and adding refrigerant. Tech a