Made contact with the park manager, who requested that I perform a camera inspection of the mainline sewer to attempt to determine the cause of the previous clog, which was apparently cleared by rescue Rooter on Friday. Perform Cameron inspection and found that there was a rubber 90 installed prior to a old cast-iron. Wood appears to be P-trap underground. The cast-iron appears to be very corroded and has a heavy amount of scaling. Our recommendation is to perform a spot repair and dig up the P-trap to determine the condition of the remainder of the pipe and also if the P-trap can be eliminated altogether, a separate estimate will be submitted for the spot repair