If swapping the lines moved the problem odds are the problem is ABOVE the sink
If it is a single handle faucet, turn off ALL water (City and pump) Bleed pressure and remove handle, you should see how to take it apart from there.
Standing up. No need for another plumber's ... backside.. photo op.
Two knob types... Same instructions, only just the hot knob.
Home was where I park it. but alas the.
2005 Damon Intruder 377 Alas declared a total loss
after a semi "nicked" it. Still have the radios
Kenwood TS-2000, ICOM ID-5100, ID-51A+2, ID-880 REF030C most times