Red Baron RL41287‑2S is an aircraft ramp power supply that delivers selectable 14 V or 28 V DC at up to 25 A, typically used for avionics and actuator testing on the flight line. Common failure modes include transformer winding insulation breakdown, electrolytic capacitor degradation in the rectifier/filter stage, relay contact wear, and overheating of internal heat‑sinked components. First‑check diagnostics should verify that the unit receives proper 115 V/60 Hz AC input, measure the DC output voltage under no load, inspect the primary and secondary transformer windings for continuity or shorting, and visually examine capacitors and solder joints for bulging, leakage, or burn marks.[oss-gpt-20b]