DC/AC Converter Control Unit, Component Description - GF54.21-P-4127A

Model 223 

with code U80 (115 V socket) 

Courtesy of MERCEDES-BENZ USA

The numbers on the pins indicate the pin numbering of the slots.

Fig 1: DC/AC Converter Control Unit Components Location - Model 223 With Code U80

Courtesy of MERCEDES-BENZ USA

Location