Sparepart/schematic for Munro Acoustics AM1

I am reparing this monitor for a customer. I have the servicemanual, but in this design Munro have used two small SMD-pcbs made by Toccatech (named DG1M00A). The schematic does not "show" what these modules contain. There are two IRFI540N mosfets, the problem is a blown 8 pin SMD-ic (driver?) called "L931FJF" (H2100 and IB is also printed omn the chip) and there are 4 smd-transistors called 618 & 718. i can't find any info on these Toccattech modules... any suggestions?

... "s-m-d"  it's a dangerous enemy of diy ..... 

The correct name on the module is Toccatatech (www.toccatatech.com is printed on the module - this is "history")