Potential leak & value stored to .. never read - messages

hi!
I am using the static analyzer to test my code. There are some messages I dont understand. The file is uploaded here (http://www.learnclip.com/iPhoneDev/leak1.png) but I will also post the code below.
There are three "lacks" in my code;
1.
"The value stored to jsonDict is never read during initialisation.."
-> I am using and therefore reading from it, but for sure, not during its initialisation process. therefore, i dont really understand this message..
jsonDict valueForKey:@"ok"
2.
The static analyzer complains about a potential leack of my jsonDict. But i am releasing it.
3.
If I am releasing it, the analyzer complains about an incorrect decrease..why?
- (void)connection:(NSURLConnection *)connection didReceiveData:(NSData *)data {
NSLog(@"didReceiveData: WriteConnection");
NSString *responseString = [[NSString alloc] initWithData:data encoding:NSUTF8StringEncoding];
NSDictionary *jsonDict = [[NSDictionary alloc] init];
JSONArray * jsonArray = [[JSONArray alloc] init];
jsonDict = [jsonArray getDictionaryFromJSONString:responseString];
if([jsonDict valueForKey:@"ok"] == NULL){
[self alertMessageNotSend];
}else{
[self alertMessageSend];
[jsonArray release];
[jsonDict release];
[responseString release];
[self stopAnimatingActivityIndicatorView];

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