I have a Benjamin 132 that is underpowered. I was thinking about getting a seal kit but noticed air was leaking where the pump tube is inserted into the upper receiver. Is this something a seal kit will cure or is the brazing where tube enters receiver shot? I haven't disassembled gun to see exactly how the pressure chamber seals. Arrow in picture shows where soapy water bubbles. Who rebuilds/reseals these and what is the usual price for that. 
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