What should I do if a commercial electric pressure cooker releases pressure slowly or leaks steam?

Please verify the following points and require itemized written supplier responses:（commercial electric pressure cooker pressure-cooker-leakage） Common causes include aged seals, blocked valves, an unlocked lid, faulty float valves or obstructed relief paths. Disconnect power and confirm zero pressure before servicing. Never force the lid open; clean valves, use matching seals and contact the supplier if the fault remains. Define capacity, accuracy, materials and operating environment before requesting quotes on a uniform basis. Request specification sheets, test reports, certificates, maintenance manuals and spare-part lists. During acceptance, verify appearance, dimensions, functions, safety protection and packaging, and keep test records. Do not compare unit price alone; include customization, freight, spare parts, after-sales support and downtime risk. Keep written records of inquiries, confirmations, FAT, acceptance and warranty commitments.