Panda needed a recharge last year, second time in 10 years of ownership. Then only a year later, performance cool instead of cold. Pump started making occasional knocking noises. I braced myself for the effort of replacing pump, condenser and probably pressure valve, as these are recommended after pump failure, as they catch debris. Local garage happy to evacuate, and refill once I'd done the work.
They recommended just a recharge first, and see whether noise goes away. Removing the port caps, one of them gave a 'psst', so both valves replaced, gas recharged, vac test good, no leaks. All seems to be working fine again. Bullet currently dodged.
The valves don't get 'tested' during a regas, as the machine is holding them open. Some places replace as routine. Always worth asking about leaks there.