Antenna fault in old (MJ08) car phone system

Hi.

Is this the Bluetooth antenna located *inside* the hands-free system? Because these units don't have external (GSM) antennas.
It's strange that everything is still working!

Can you access it and potentially fix something?
Something like a cold solder joint?

I have a spare part number 3C0 035 729 F (MJ07 from a 3C model) lying around; I might need to replace it sometime.

Code:

Adresse 77: Telefon        Labeldatei: RKS\3C0-035-729.lbl    Teilenummer SW: 3C0 035 729 G    HW: 3C0 035 729 G    Bauteil: Telefon             7609     Revision: 00012000    Seriennummer: 0000B6A004801    Codierung: 0016041    Betriebsnr.: WSC 00000 785 00200    VCID: 27566BDE96966426FAD-8072 1 Fehler gefunden: 01524 - Antenne für Telefon             007 - Kurzschluss nach Masse              Freeze Frame:                     Fehlerstatus: 01100111                     Fehlerpriorität: 3                     Fehlerhäufigkeit: 1                     Verlernzähler: 69                     Kilometerstand: 160227 km                     Zeitangabe: 0                     Datum: 2000.00.00                     Zeit: 11:26:29