Safety caps do fail short, not enough though to create a fault condition a fuse or breaker can clear. RIFA caps in old Mark Levinson gear are notorious for this.
If it's the "round cylinder", it is possible that something conductive shorted the power supply cap or caused a voltage reversal. Who knows, a discarded component lead was dropped inside the unit during production and wiggled its way to a bad spot during shipping/setup.
If it's the "round cylinder", it is possible that something conductive shorted the power supply cap or caused a voltage reversal. Who knows, a discarded component lead was dropped inside the unit during production and wiggled its way to a bad spot during shipping/setup.