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| X20 Serial Range | Issue Found | Fix | |------------------|--------------|------| | X20-0421 to 0841 | Output inductor undersized for 100% duty at 400A+ | Retrofit kit P/N GEM-IND-HD | | X20-0901 to 1122 | Waveform smoothing capacitor drift after 500h | Replace C17 board | | All units | Ground sense circuit can float +1.5V | Dedicated work lead directly to coupon (not table) |