いってまいります could be an inflection of いう, with these forms:
- Te-iru-form. It indicates an action that is ongoing.
- Masu-form. It is the polite form of the verb.
Searched for いってまいります. You can also try a search for "ittemairimasu".
Searched for いってまいります. You can also try a search for "ittemairimasu".