$query->execute() not working when condition()'s are supplied

I have printed out the query, pasted it into my query analyzer, substituted the desired values, and I get the expected rows. The execute() call, however, returns no rows. When I remove the condition() statements, it works just fine, returning all rows.

I know that the values in the variables supplied to the condition() calls have the correct data in them, as I've debug printed them for verification. There must be something I'm not doing correctly with the $query->condition() call.

I'd really appreciate any help, thanks.

jyg

// QUERY API - , $query->execute returns 0 rows

    function list_fixed_debt_series($params) {
        drupal_add_http_header('Content-Type', 'application/json');
		$instid = isset($params[0]) ? $params[0] : null;
		$series = isset($params[1]) ? $params[1] : null;
        
        $query = db_select('yuba_vrdn', 'v');
        $query->join('yuba_debt_fixed', 'f', 'v.vrdn_id = f.vrdn_id');
        $query->addField('v', 'series_name');
        $query->addField('v', 'ticker');
        $query->addField('v', 'amt_outstanding');
        $query->addField('v', 'maturity_dt', 'maturity');
        $query->addField('f', 'nxt_call_dt', 'first_call_date');
        $query->addField('f', 'coupon');
        $query->addField('f', 'muni_issue_yld', 'original_issue_yield');
        $query->condition('v.series_name', $series, '=');
        $query->condition('v.institution_id', $instid, '=');
//         return $query->__toString();
        $result = $query->execute();
        $alldata = $result->fetchAll();
        
        return json_encode($alldata);
    }    


// PREPARED STATEMENT

SELECT v.series_name AS series_name, v.ticker AS ticker, v.amt_outstanding AS amt_outstanding, v.maturity_dt AS maturity, f.nxt_call_dt AS first_call_date, f.coupon AS coupon, f.muni_issue_yld AS original_issue_yield
FROM 
{yuba_vrdn} v
INNER JOIN {yuba_debt_fixed} f ON v.vrdn_id = f.vrdn_id
WHERE  (v.series_name = :db_condition_placeholder_0) AND (v.institution_id = :db_condition_placeholder_1) 


// AS RUN IN QUERY ANALYZER, returns 13 rows

SELECT v.series_name AS series_name, v.ticker AS ticker, v.amt_outstanding AS amt_outstanding, v.maturity_dt AS maturity, f.nxt_call_dt AS first_call_date, f.coupon AS coupon, f.muni_issue_yld AS original_issue_yield
FROM 
yuba_vrdn v
INNER JOIN yuba_debt_fixed f ON v.vrdn_id = f.vrdn_id
WHERE  (v.series_name = '2004B') AND (v.institution_id = 3)