Lahore, Apr 24: American Gurdwara Parbandhak Committee (AGPC) Co-coordinator Dr Pritpal Singh has reportedly called upon the Pakistani authorities for the release of Sarabjit Singh, an Indian national imprisoned in Lahore jail and facing death sentence, and also restore the honour of Sikh traffic warden Gulab Singh who was forced to resign last weekend after one of his colleagues tossed up his turban.