Need help with Ryobi charger

I have a BCL14181H 18v charger that doesn't charge. Diode D9 which appears to be in parallel with R25 is shorted (maybe). What is the part number and which way does the cathode go? I do not have any blown components but the unit will not charge a battery. This is a Ryobi charger.

R25 is a 47 ohm resister.

Sorry, the two connect to U1 (the switch mode controller) through R24.