>this post< may help you. Another member found a suitable replacement port pretty cheap for his HH model (I'm not sure if the same exact port setup is used in the 15X). Have you opened up your scanner to check the port? If it is a surface mount part then the solder pad may have lifted off the PCB, if this is the case then you may be able to repair it by resoldering it or wiring a short jumper wire to a suitable trace.
Whether or not you can repair it yourself depends on your soldering/desoldering skills. With a steady hand and a good quality soldering iron you should be able to tackle it yourself. Alternatively you can send it to Uniden for their flat rate $50 repair. Either way I would start by opening up the scanner to see what's wrong first, and go from there.
Good luck