re-negotiating the term of a morgage with bank

[eyesgreen_1]

hi all,I took a 30 year morgage (€182,000)out on an investment property 2 and a half years ago..balance is now €177000 with repayments of €861 per month.The rental income on the property is €580 per month leaving a shortfall of €280.I was thinking of trying to re-negotiate with the bank to try and increase the term of the morgage so as to reduce the monthly repayments...just wondering are the banks in general open this type of re-negotiation and is it a sensible idea ?....any advice on this would be much appreciated..many thanks.