Upon arrival customer stated that multiple things in trailer weren't working. Inspected breaker feeding trailer and noticed breaker has been arcing behind and caused failure on a phase. Unrelated to work preformed last firday. However going in panel could have ,oved breaker enough to being existing issue to light. Customer had a 60 a square d qo breaker that was removed when I did the job. I replaced breaker for him and all is working. Charged service fee. Not a call back