Merge code of same operation with two different conditions

I have a question. I'm trying to tidy up some coding. I have this part of code

        if (self.type == self.BETAECM):
        for line in contentInfo:
            if line.startswith("caid:"):
                caid = self.readEcmInfo(line)
                if "x" in caid:
                    idx = caid.index("x")
                    caid = caid[(idx + 1):]
                    caid = caid[:4]
                    caid = caid.upper()
                    if (caid >= "1700") and (caid <= "17FF"):
                        return True
            elif line.startswith("====="):
                caid = self.readCaid(line)                        
                if "x" in caid:
                    idx = caid.index("x")
                    caid = caid[(idx + 1):]
                    caid = caid[:4]
                    caid = caid.upper()
                    if (caid >= "1700") and (caid <= "17FF"):
                        return True
        return False

As you can see there are two different conditions that are handled with the same operation I want to tidy up everything so that the identical parts of the code (what starts with if "x" in caid) are only written once. Is this possible? Thanks in advance!