I have done some reading of the datasheet of the TPS54335-2. C3006, R3011 and C3008 seems to be the gain of the error amplifier. R3015 is in a voltage divider with R3012 and R3013 to set the output voltage.
If R3015 is 10k and I measured R3012 and R3013 to 2.1k and 9.1k on the board, the output voltage would be around 1.7V. Anyone know if this is correct? The internal reference voltage is 0.8V.
I have made a schematic in KiCad where I put in the values I have measured and those I have been told. For C3006 and C3008 I took the example values from the datasheet.
I have attached...

Thank you, I shall test it and see if it works....