Repair a 220V PCB trace
The fault was lack of water protected insulation that caused a corona action burning the copper.  Obviously not designed for use near water.  A solid wire conductor and a silicone or other suitable coating of insulation is best . The power strip may have had an arc current just below the strip’s breaker rating or didn’t have one.  Buyer/Designer beware.  This design is unsafe without either suitable coating or an air gap of >= 4 mm between conductors.