<calculator>
270 Pax one overnight hotel @ $100 = $27,000
New Crew = 20 ppl * 14 hours @ $80/hour average = $22,400
Fuel 60 tonnes @ .8 density approx =75000 litres @ say 0.90/litre = $67,500
Additional ground services for unscheduled return $2000
landing Fees & Nav charges say $15,000
Inspecting removing replacing engine, say, $12,000
Fixing broken engine, say... $250,000
OK, OK, Say $5,250,000!
Captain's and first officer's underpants replaced $30
nah, $120...if the engines getting that much attention, give 'em a couple pairs, and make 'em Calvins!
Tea & bickies with CP $250
Tech crew time responding to the inevitable enquiry $10,000
PR flack deflection spin doctors $12,000
Brand damage $1M (guess)
... to maybe $100M??
Total: $6,418,270
- $105,418,270 (approx range)
Look on Darth's Face: Priceless. 
</calculator>