Check the output DC offset, if more than 100mV, replace the IC LM2902 with LM324or the same, it might have developed a fault. Other thing you can check is Trimpot near it, its contact usually opens.
sir in P2.0 one side is now ok . but in 2nd side audio is not clean .nd volume is going up nd down .i think limiter is not working wt will i do sir .... thank u