Machine is completely disassembled, infuser (brew group) rebuilt, boiler(s) descaled, plumbing seals replaced, grinder burrs replaced and calibrated, moving parts lubricated, critical parts rebuilt/replaced as needed, housing and all loose parts meticulously cleaned inside and out. Then, all functions/features are tested, adjusted and verified for perfect operation.
Buying a fully reconditioned machine can save you over 50% of the cost of a new machine.