Diagnosed a Carrier 24APA736A003 air conditioner exhibiting no cooling. Identified failed compressor using Fluke 116 HVAC multimeter. Replaced compressor with Bristol H23A463ABCA reciprocating model. Installed new Copeland 88-108 start capacitor and Supco SPP6 hard start kit to enhance compressor startup. Recharged system with R-410A refrigerant using Fieldpiece SM480V digital manifold. Replaced clogged TXV with Sporlan BBIZE-4-GA thermostatic expansion valve. Conducted nitrogen pressure test to verify system integrity. After repairs, system achieved proper superheat and subcooling values, restoring efficient cooling operation.