You say the breaker supplies power to just one or two lights? And no outlets, fans, attic circuit? Map out all affected electrical boxes.
Move wire from suspect breaker to another same-size breaker and see what happens.
Move wire from the other breaker a to newly installed breaker, to check if breaker is main suspect.
Open each switch and outlet box affected by suspect breaker.
Disconnect power at light switch, and see if breaker still has problem.
Unplug all things from outlets on circuit.
One by one, check each electrical box for burned wires and loose wires.
Use nose to smell for burned condition.
Add a comment and update as you progress through troubleshoot.
http://waterheatertimer.org/Troubleshoot-household-electricity.html If you need further help, Iām available over the phone at
https://www.6ya.com/expert/gene_9f0ef4df2f9897e7
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