Answering question for Reverb Tank - Accutronics, 4EB3C1B, Long Decay, 2-Spring

Product:
Reverb Tank - Accutronics, 4EB3C1B, Long Decay, 2-Spring

Question:
Hi, my Boogie .22 Caliber+ combo amp may need a new reverb tank. Mine is Accutronics #8AB2A1B. Please reply before I order so I'm headed in the right direction. My reverb got weak first & then died. Changed the 12AX7 V4 per Mesa's owner's manual but no fix. Next removed the tank to test resistance. I'm a rookie at this, so let me list here what the K-ohm readings were on metter: Output cable resistance is .205 (I assume 200 ohms) with test leads across output jack pos/neg. Kept one test lead on the tank Output cable shield, and put other test lead on the tank Input center conductor--and the meter read 255-260. I assume that's 255,000-260,000 ohms through the tank circuit. That appears WAY high if I understand right what I've read online. Thanks for reading my trouble-shoot and letting me know if the resistances clearly call for a new Series 8 tank from you. If so I'll order with you. Thanks VERY much! Robert