The Red Baron RB‑142825 is an aircraft ramp power supply (APU) that delivers a selectable 14 V or 28 V DC output at up to 25 A, with built‑in filtering and overcurrent protection via a circuit breaker. Common failure modes include blown fuses or tripped breakers due to shorted load circuits, degraded electrolytic capacitors causing voltage ripple or overheating, and transformer winding insulation breakdown leading to output voltage sag. First‑check diagnostics should verify input AC line voltage and frequency, confirm the breaker status and fuse integrity, then measure the DC output with a calibrated multimeter while monitoring for excessive heat or audible hum on the filter components.[oss-gpt-20b]