Given that the current density J = xyz (2 x ax - 4 y ay - 3 z az) amperes per square meter, determine the amount of current, in milliamperes, passing through the surface x = 1 m, -4 < y < 8, -9 < z < 1. All coordinates are measured in millimeters. Express your answers accurate to four decimal places, whenever applicable.

Given that the current density J = xyz (2 x ax - 4 y ay - 3 z az) amperes per square meter, determine the amount of current, in milliamperes, passing through the surface x = 1 m, -4 < y < 8, -9 < z < 1. All coordinates are measured in millimeters. Express your answers accurate to four decimal places, whenever applicable.