RV Repair: Missing 120 volt supply, volt supply, fuse panel

Question
Hi,
I have 2002 Alumascape 27sks pull trailer. The Refer is in-op in A/c mode and is ok on gas. All fuses are good but, the 120v supply at refer is missing. All outlets are working and air conditioning is ok. I don't see a breaker for the 120v feed to the refer in the trailer panel or listed in the manual. I fear that there an open in the wiring within the wall or ceiling. But before I can forsure say that I would like to know where/ what wiring is the feed from behind the inverter/ distribution center. And is there common open in the wiring to look for. I am toying with the thought of running a new circuit to the refer.

Thanks for any help and for reading my problem,
                                               Bill C.

Answer
how long have you owned the trailer?
is there holes or markings from an old receipt in the opening?
i would run a new circuit if it was here after tracing all thats already in use
if you can take a couple of pictures of the fuse panel and the refer opening it might help