I assume if you had the PCB looked at and repaired there was a fault on the PCB, unfortunately this does not also clear secondary faults, which are not uncommon. You require a boiler engineer to do some fault finding, with the PCB now hopefully working correctly, the fault finding will be much easier.
Biasi Rivas are not a particular good product, once one thing goes, you tend to get a number of issue with them, so not surprised if you have a pump failure.
Biasi Rivas are not a particular good product, once one thing goes, you tend to get a number of issue with them, so not surprised if you have a pump failure.