Dead, clicking noise, and overheating during wireless charging

Device: Google Pixel Buds Pro Charging Case

Symptoms:

My charging case is completely unresponsive. It does not show any LED light when connected to a USB-C cable (tried several certified PD chargers like Ugreen 30W and Baseus 65W).

Specific findings:

1. Overheating: When placed on a wireless charger (MagSafe style), the LED flashes amber momentarily and then fades. The bottom of the case becomes very hot within minutes.
2. Audible noise: If I hold the case to my ear while on the wireless charger, I can hear a fast, periodic clicking/chirping sound (likely a PMIC/controller stuck in a restart loop or "hiccup mode").
3. Reset: Holding the pairing button for 30+ seconds gives zero response.
4. Partial Passthrough: One earbud managed to get 5% charge after a long session on the wireless charger, even though the case itself remains dead.

What I've tried:

• Cleaned the USB-C port and internal pins with Isopropyl alcohol.
• Tried various power adapters and cables.
• Attempted factory reset multiple times.

Hypothesis: I suspect a short circuit on the main logic board or a failed PMIC. Given that the case is ultrasonically welded/glued, is there any known way to repair this without completely destroying the plastic shell? Are there common capacitor failures on this board?